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LanthanumK
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My favorite chemical smell would be the smell after I handled a copper(II) chloride crystal. I have not smelled any really bad or really good chemical
smells.
Which one smells worse: The worst smelling inorganic compounds (such as H2Se) or the worst smelling organic compounds (such as butyric acid)?
hibernating...
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cyanureeves
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i like ammonia and find it hard not to smell again and again. chloroform is nice and tastes good but the smell right away warns the brain that it is
something to run from. i used to like nitric acid smell when i first made it after many failed attempts but it took a toll on my health. the long
lasting headaches made me almost hate the smell and now when i walk my dog and the city bus goes by me i can smell the nitric fumes from the exhaust.
good thing most people dont know what that smell is.
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barley81
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I also love the smell of ammonia, and I eat salty licorice with NH<sub>4</sub>Cl. The smell is also addicting to me. Ether, methanol, and
ethanol smell nice to me, as well as some simple esters (I don't remember which). I hate the smell of SO<sub>2</sub>, but oddly not
H<sub>2</sub>S very much.
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ItalianChemist
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I like very much the odor of bromine, iodine and benzaldehyde. Also (COCl)2 has a nice smell
I don't mind ammonia, amines and H2S
I hate 2,4,6-trichlorophenol and tetrachloroethylene
[Edited on 4-7-2011 by ItalianChemist]
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Mixell
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I like the smell of oxalic acid, very lemony.
And the smell of SO2.
But I hate the smell of concentrated acetic acid very much.
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ItalianChemist
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You are right! Acetic acid is terrible!
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Lambda-Eyde
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I absolutely HATE ammonia, not because of the smell itself, but because of its habit to make me choke and make my eyes run... A 5% solution may have a
nice smell, but the 25% stuff is a entirely different beast!
Also, the smell of white phosphorus is terrible. Not because of the smell itself, but because of the scared feeling I get when I know I can smell
something as incredibly toxic as white P... 
My new favourite must be nitrobenzene. Mmm! I just hope I don't get any nitro-headaches...
This just in: 95,5 % of the world population lives outside the USA
You should really listen to ABBAPlease drop by our IRC channel: #sciencemadness @ irc.efnet.org
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ItalianChemist
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Benzene derivatives have all a nice smell!
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simba
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I love the smell of piperonal, benzaldehyde and other aromatic aldehydes...
on the other way, dimethylsulfide is pretty bad, and I REALLY hate the smell of iodine too.
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The WiZard is In
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US Gov Standard Bathroom Malodor
This from Wiki-P
Standard bathroom malodor
The US Government Standard Bathroom Malodor is quoted to have this composition:[2]
Dipropylene glycol 62.82%
Skatole 0.91%
2-naphthalenethiol 0.91%
Thioglycolic acid 21.18%
Hexanoic acid 6.00%
p-cresyl isovalerate 2.18%
N-methyl morpholine 6.00%
---------
Link "[2]" does not work.
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The WiZard is In
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Female malodor
Tampon removal device Keith Edgett et al
US Patent application 2008/0058751 Al
MALODOR: 1. Feminine Malodor including trimethylamine,
isovaleric acid, and putrescine 2. skatole 3. ammonia (NH3)
Attachment: Tampon_removal_device.pdf (66kB)
This file has been downloaded 888 times
I always worry when they glow in the dark.....!
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mr.crow
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Quote: Originally posted by The WiZard is In  | Tampon removal device Keith Edgett et al
US Patent application 2008/0058751 Al
MALODOR: 1. Feminine Malodor including trimethylamine,
isovaleric acid, and putrescine 2. skatole 3. ammonia (NH3)
I always worry when they glow in the dark.....! |
If you are getting fishy amine smells you are doing something wrong :s
Double, double toil and trouble; Fire burn, and caldron bubble
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The WiZard is In
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| Quote: Originally posted by mr.crow | | Quote: Originally posted by The WiZard is In | Tampon removal device Keith Edgett et al
US Patent application 2008/0058751 Al
MALODOR: 1. Feminine Malodor including trimethylamine,
isovaleric acid, and putrescine 2. skatole 3. ammonia (NH3)
I always worry when they glow in the dark.....! |
If you are getting fishy amine smells you are doing something wrong :s |
Moi? No. Not I — the female carbon based unit dobe a fault.
What's confusion?
A blind lesbian in a fish market.
If little girls are made of sugar and spice —
why do they test like anchovies?!
Three things a woman can do a man can't.
Have a period.
Have a baby.
Have sex when she is dead.
Attachment: Vaginal Menstrual Cycle.pdf (768kB)
This file has been downloaded 1084 times
Attachment: Vaginal Odors letter.pdf (315kB)
This file has been downloaded 583 times
djh
----
If the county pervert
posse comes a knocking
you have never heard of
me.
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Mixell
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Believe it or not, a man too can have sex while being dead, just not with the organ you'll first think of...
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The WiZard is In
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| Quote: Originally posted by Mixell | | Believe it or not, a man too can have sex while being dead, just not with the organ you'll first think of... |
Pervert.
Snicker-Snicker, Cachinnate, Snort, Tee-hee, Chortle, Guffaw.
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The WiZard is In
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Stench warfare
New Scientist
07 July 2001 by Stephanie Pain
GOTTA get out of here. Heart's pounding. Can't think. Can't speak. Daren't breathe. Just run. As the stench rolls down the street, panic spreads.
Everyone's on the run now. They don't know what the evil-smelling odour is but their noses tell them it's dangerous, and within seconds their stomachs
sound the general alarm. In two minutes the streets are empty. All that's left is a terrible stink.
This hasn't happened yet, but it could if the US Army succeeds in its effort to create the mother of all stink bombs. Their aim is to have a weapon
that doesn't kill or injure anyone, but instead triggers fear, panic and an overwhelming urge to run away. The mixture of malodorous molecules has to
add up to a pong so repulsive it's truly terrifying.
The search for the perfect stink bomb is part of the Pentagon's Nonlethal Weapons Program. The US Army wants a stink to drive away enemy troops or
hostile crowds and to enforce no-go zones around sensitive military installations. It could also help peacekeeping forces keep warring factions apart
by creating stench-filled exclusion zones. Police forces would have plenty of uses for a stink bomb, too. It would be ideal for ending a siege without
firing a shot, or for dispersing rioters or even marking the ringleaders so they can't escape into the crowd.
"It would give us an offensive capability against large and unruly groups of people, if they are unwilling to move or are openly hostile," says
Pentagon spokesman Lieutenant Colonel George Rhynedance. "And it would minimise the risk to our own people and to the antagonists."
The Army has been down this route before, with a singular lack of success. During the Second World War, the Office of Strategic Services conjured up a
secret weapon known affectionately as "Who Me?" It was a noxious fluid intended for use by the French Resistance. The aim was to humiliate German
officers by making them smell foul. "Imagine the worst garbage dumpster left in the street for a long time in the middle of the hottest summer
ever—and that gives you a taste of the Who Me? quality," says Pam Dalton, a cognitive psychologist at the Monell Chemical Senses Center in
Philadelphia.
Who Me? was certainly loathsome enough for the job, but it had one big drawback. The mixture was so volatile that it was impossible to "bomb" the
target without contaminating everything in the area, stink bomber included. "Suffice it to say it wasn't one of the more effective strategies," says
Dalton, who is leading the search for a better stink bomb.
Could any stench really be so repulsive that it strikes genuine fear into people's hearts and causes them to flee? Smells certainly have the power to
alter our behaviour. The aroma of fresh bread lures us towards the bakery, while the pungent pong of a filthy toilet sends us reeling back to the
door. Some smells are already used as deterrents. In the US, signs warn that some roadside firs are sprayed with a potent mix of molecules, including
fox urine, to protect them from Christmas-tree thieves. The smell is barely noticeable outdoors, but in the warmth of the home the foxy stench is
overpowering. And one company has even considered marketing a vomit-scented fridge "freshener" to deter dieters from snacking.
Unpleasant is one thing; frightening is something else. Yet smells can trigger intense emotions—including terror. When odour molecules
dissolve in the mucous membranes of the nostrils, they set off signals that take two separate routes into the brain. One path leads to the thalamus
and cortex, where the signals are translated into conscious awareness of the smell. The other leads to the limbic region of the brain, the unconscious
core where emotions are generated (see Diagram).
This is true for all kinds of smells, nice and nasty. However, a sniff of something nasty activates a particular part of the limbic system, the
amygdalae—a pair of small, almond-shaped pieces of tissue deep within the brain. Studies in animals suggest that the left amygdala is acutely
sensitive to the sight, sound or smell of anything dangerous and plays an important role in awakening fear.
"Fear and odours are very closely linked," says José Pardo, who runs the Cognitive Neuroimaging Unit at the Veterans Affairs Medical Center in
Minneapolis, Minnesota. "The amygdala has a key role in fear conditioning." And that goes for humans just as much as other animals. The sense of smell
is evolutionarily older than sight or hearing—the other long-distance senses—and is designed to warn of dangers such as spoilt food
or nearby predators.
Pardo and his colleague David Zald found they could send the left amygdala into overdrive with nothing more than a whiff of a ghastly smell. They
wafted a cocktail of sulphide gases—a sort of synthetic fart—past the noses of volunteers, while scanning their brains to see which
parts were doing what. The captive sniffers tensed their muscles and reported feelings of revulsion, disgust and fear. The smell activated both
amygdalae, but the more revolted and fearful people felt, the more active their left amygdala became.
How we perceive and respond to a smell depends on whether we recognise it and what sort of associations it has. Humans have an extraordinary memory
for smells, and just a whiff of something can bring past experiences rushing back. A smell can be enough to revive old terrors. "For some Vietnam
veterans the smell of mould, the sort you get on tent fabric, will trigger a fear flashback," says Pardo. "The smell of jet fuel or burning flesh can
produce terrible fear."
For people who haven't lived through such terrifying experiences, unfamiliar smells are more likely to prompt panic than even the nastiest odours
they've smelled before. "Any odour has the potential to strike fear into someone's heart," says Dalton. "With a new smell you have little to go on. If
you can't categorise it you don't know if it's dangerous. There's little you can do but run away."
That's exactly the reaction Dalton wants to provoke. The perfect stink would trigger an emotional response—preferably one that sets you
running—before the reasoning part of the brain can work out what's going on. In theory, it's possible. "The pathways are certainly there,"
says Pardo.
The hard part is finding one smell that works on everyone. There's little evidence that humans are born with preferences for certain odours, the way
they are with tastes. But even if people are, these preferences can easily be overcome by experience. "People who live around horses like the smell of
manure. Some people even like the smell of skunk," says Dalton. People's likes and dislikes also vary enormously between cultures. To people in
South-East Asia, for example, the fetid smell of the durian fruit holds the promise of something delicious. To almost everyone else, it's
stomach-churning. "For a novice it's almost impossible to get it past the nose and into the mouth," says Dalton.
At Monell, Dalton and her team have been searching for a stench that transcends any cultural differences. They tested a range of horrible smells on
five groups of volunteers of different ethnic origin—whites, African-Americans, Asians and Hispanics from the Philadelphia area, and a group
from the township of Grahamstown in South Africa's Eastern Cape province.
Dalton's team quizzed the volunteers on the repulsiveness of each stench, how it made them feel and whether they thought it was harmful. And as the
volunteers breathed in the foul odours, the researchers logged their bodies' physiological responses. They found that with the vilest smells, people
take shallower breaths, their hearts beat faster, and their stomachs churn more vigorously.
Most of the bad odours they tested proved disappointing. Everyone hated the smell of butyric acid—a cross between rancid butter and sweaty
feet—but few people thought it was harmful. Burnt hair, supposed to mimic burnt flesh, turned out to be surprisingly inoffensive. Even the
smell of vomit—an off-the-shelf mix called Proprietary Vomit Odor—was only mildly objectionable.
The response to one of Monell's special mixtures revealed a major cultural difference. This odour was developed to mimic the smell around sewage
treatment plants and is reminiscent of gently decaying rubbish with a hint of faecal matter. Everyone found it disgusting, but the people from
Grahamstown were also afraid of it. "To us in the US, it's a nuisance, but we can usually walk away from it," says Dalton. "In the townships, where
there's little modern sanitation, it's a health hazard and people are very afraid of it. They think breathing it would be harmful."
No luck with these, then. But Dalton did find two loathsome odours that transcend culture. One is a truly repugnant mixture called US Government
Standard Bathroom Malodor, a stink concocted to test the efficiency of deodorant cleaning products. "It's very pungent," says Dalton. "More precisely,
it smells like shit, but much, much stronger. It fills your head. It gets to you in ways that are unimaginable. It's not something you are likely to
come across in the real world."
The smell is so awful that some volunteers began to scream and curse after just a few seconds' exposure. Even though the smell is quite harmless,
almost everyone thought it would damage their health. Dalton wasn't surprised. "If anything transcends culture it should be something like this," she
says. "There aren't many cultures that embrace human waste and this is far worse than any regular human waste."
Another candidate for the title of the world's worst smell is an updated version of that old wartime weapon, Who Me? This classic has a bouquet rich
with foul-smelling molecules, dominated by a sulphurous pong. "If I had to predict one class of odours we had a predisposition to react negatively to,
it would be the sulphur compounds," says Dalton. "It's important to detect food spoiling or carcasses rotting. It must have significance in terms of
survival."
Neither of these smells is likely to make the perfect stink bomb by itself. But together they just might, says Dalton. "You get a bigger bang for your
buck with a mixture," she says. A combination of two of the world's worst smells should affect everyone—even those who might be "smell-blind"
to one of its components—and should create something so far removed from anyone's experience that the fear factor kicks in.
But before the troops roll out armed with stink bombs, there are practical problems to solve. You have to deliver the stench without getting it
everywhere, as happened with the original Who Me? And the mix must disperse easily enough to be effective, yet not disappear so fast that people just
hold their breath and wait for the pong to pass. "Once we've got the sensory properties right, the chemists can tweak the mix to make it move in a
particular way," says Dalton. "They can add chemicals to make it hang around near ground level or move higher in the air."
Dalton also has to discover what proportions of Bathroom Malodor and Who Me? produce the most evil-smelling mix. "There are no clear physical or
chemical principles to determine how we perceive the end result," she says. "It's trial and error." And that poses a risk that makes her hesitate. "If
I take that step, I'm just not sure I could keep anyone here working with me."
The human stink bomb
All debt collectors have ways of making people pay up. Andy Smulion, a man employed by a London magazine to collect unpaid bills, had an almost
infallible technique. There was nothing illegal about it and no one got hurt. Smulion would simply turn up at the defaulter's office wearing his most
vile-smelling clothes and hang around until they could stand the stink no longer. His "victims" described the stench as part skunk and part sewage,
with a whiff of rotten eggs. It was a case of cough up or throw up. According to Parade magazine, which reported Smulion's tactics in 1979, he got
results. And no one ever tried to beat him up: they couldn't bear to get close enough.
[Reminds me. Years ago I wanted to stop off at a store in
Manhattan on my way to work, so I got off at a stop other
then my usually one. Going up the stairs there was a bum
( to be PC a homeless person) a standing. No shirt,
five feet away.... Yahoooo what an odour! Me thinks the last
time he bathed was the day he was born. Gawd.
You can tell the tourists in the subway - la train pulls in packed -
except for one car which has only one passenger - they run for
it - WRONG.]
Bad day in Salt Lake City
On 18 March 1999, the Chevron oil refinery in Salt Lake City belched out a small, smoky cloud that drifted along near the ground towards the city
centre. As it reached the Utah Symphony Hall, the air conditioning intake sucked some of it into the building, where two thousand children sat. At the
first sniff of the strange smell, a couple of children complained of feeling ill. Suddenly everyone felt sick. Once outside the hall, children lay
around on the grass gasping for breath, and dozens were taken to hospital.
As the cloud travelled over the city, panic spread. Chevron admitted at the outset that its plant was responsible for the cloud but pointed out that
the vapours contained nothing harmful—just a mixture of hydrocarbons. Despite the reassurances, the "odor hotlines" didn't stop ringing for
the next two weeks: people were so convinced that there was something harmful in the air that they took fright at the first whiff of something
unusual.
Something rotten in the Senate
On Monday 16 August 1999, a little after 9 am, staff at the Dirksen Senate Office Building in Washington DC were settling down to work. Then someone
in the cafeteria smelt something unfamiliar. It wasn't very strong but it was definitely a bit "off". No one could see where it was coming from and no
one could identify the odour. That made it suspicious. Was this a terrorist gas attack? Someone raised the alarm.
The building was quickly evacuated and nine staff from the cafeteria were rushed to hospital. People fled, leaving police, a hazardous-materials team,
an advanced life-support unit, doctors, four teams of paramedics and the local fire chief to investigate. They didn't find any chemical weapons. But
they did find a bag of rotting onions—they had been peeled and sliced for the salad bar and then forgotten.
The unfamiliar smell had wafted through the air ducts, spreading fear as it went. If people had been able to identify the smell, they wouldn't have
panicked. "But when people don't recognise a smell they assume it's a hazard," says psychologist Pam Dalton.
--------
Aroma Therapy
In The Military, It's Known As 'Nonlethal Weapons Development'
http://www.sfgate.com/cgi-bin/article.cgi?file=/gate/archive...
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The WiZard is In
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Malodorant composition(s) a US Patent
US Patent 6242489
Malodorant compositions
Inventor: Virginia Ruth Pinney
Assignee: Ecological Technologies Corporation
The malodorant compositions provided by the invention are formed
from ingredients comprised of at least a malodorant compound
and a carrier liquid, the compositions having a toxicity category
rating of at least III. Preferred malodorant compounds suitable for
use in the compositions of this...
Non-limiting examples of potentially suitable organic nitrogen compounds include 1,4-diaminobutane, 1,5diaminopentane,
4-fiuoro-alpha-methylbenzylamine, 2-ethylpyridine, 3-ethylpyridine, 4-ethylpyridine, 2-ethyl-3methylpyrazine, 3-ethyl-2-methylpyrazine,
2,3diethylpyrazine, 1-methylpyrrolidine, l-(dimethylamino) pyrrole, 3-methyl indole, 4-mefhyl indole, 6-mefhyl indole, 2,3-diethyl 1-mefhyl indole,
ethyl 1-azetidinepropionate, S-(+)-2-methylbutyronitrile, butyl isocyanide, 1,1,3,3tetramethylbutyl isocyanide, lH-benzotriazol-l-ylmefhyl isocyanide,
isophorone diisocyanate terminated poly (neopentyl glycol adipate), methyl ethyl(tributylstannyl) carbamate, and the like.
&c., &c., &c.........
Attachment: 6242489_Malodorant_compositions.pdf (76kB)
This file has been downloaded 790 times
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Rogeryermaw
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i truly loathe the odor of chloroform. even sitting here thinking of the smell triggers my gag reflex...
ammonia smells nice and clean. it is hard not to smell over and again.
i love the smell of burning black powder and the smell of solvents/lead/burned gunpowder from inside the firing range. ether is not so nice nor is
ethyl bromide. i don't mind the odor of chlorine gas but a quick whiff is all i can take. it's malevolent effects are rapidly apparent.
isopropyl is not so bad and methyl is hardly noticeable but the smell of ethanol me no likey. i have been bombarded by the vomit-ethanol ridden stench
of the holding tank in jail enough. can't even drink a beer anymore it's gotten so bad(not sure my liver could handle it the way it's been acting up
anyway).
boiled cabbage tastes wonderful but i can't be in the house with it cooking.
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redox
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| Quote: Originally posted by Rogeryermaw | | i don't mind the odor of chlorine gas but a quick whiff is all i can take. it's malevolent effects are rapidly apparent. |
Agreed. Chlorine sends fear through my body, because whenever I smell it, it means my apparatus is leaking. Pools have never been the same....
I recently found that octyl alcohol smells really nice, very faintly like oranges (this might be octyl acetate impurity).
I asked my father (the organic chemist) what the worst-smelling chemical he knew of was, and he said valeric acid. Really foul!
My quite small but growing Youtube Channel: http://www.youtube.com/user/RealChemLabs
Newest video: Synthesis of Chloroform
The difference between chemists and chemical engineers: Chemists use test tubes, chemical engineers use buckets. |
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Rogeryermaw
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i use that "pool smell" to my advantage. if can not detect a trace of chlorine in my pool i know an algae bloom is not far away. of course, the
testing kit does i fine job of this, but i don't like to over treat the water. just enough to keep the nasties down.
another one i like is gasoline. not too much, mind you, but a quick whiff on the breeze while refueling the lawn equipment is always okay.
recently, the neighbors burned a large quantity of plastic. while i have smelled much worse, that one always curls my nose hair. the sharp stench of a
hair and nail salon also will stop my in my tracks.
long ago i lived in houston texas. i truly dreaded any time i had to drive through pasadena. the refinery smell is one that will stick with you. now,
living in hog country, i will drive twenty miles out of my way to avoid riding behind a trailer loaded with pigs. their smell gives meaning to
"happier'n a hog in shit!"
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White Yeti
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The worst smell I can think of is the smell of rotting algae (Codium fragile to be specific). I threw up at that smell....
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Arthur Dent
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On the subject of worst smells for me, there are two aromas that I cannot stand, and will go out of my way to avoid. The first is roofing tar,
whenever a roofing company is in the neighborhood and I get a whiff of the boiling, smoking tar, I get sick to my stomach. When I'm on the road, I
will pass by or let pass the trucks with the boiling tar trailers because the aroma at that point is at its strongest.
The second is the aroma of vehicles using diesel fuel. This literally chokes me out! A big truck with the sooty exhaust pointed in my direction will
literally suffocate me. Last week, I was at work and started smelling the odor of burnt diesel, I quickly glanced at the window to see that three
floors below, a large delivery truck was idling and sending its ungodly output towards the windows of our office. We quickly closed them but by then
the harm was done, the office smelled of diesel all day. Lovely.
As far as pleasant odors, I do not mind the smell of most solvents, particularly acetone and isopropanol. One of my favorite solvents is Laphroaig
Quarter Cask, the aroma is truly heavenly!
Robert
--- Art is making something out of nothing and selling it. - Frank Zappa ---
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Chemistry Alchemist
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Best: Wintergreen Oil... i know there is another but cant think of it
Worst: Sulfur Dioxide, Hydrogen Sulfide, and Ammonia worst smells ever!
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mr.crow
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| Quote: Originally posted by Arthur Dent | On the subject of worst smells for me, there are two aromas that I cannot stand, and will go out of my way to avoid. The first is roofing tar,
whenever a roofing company is in the neighborhood and I get a whiff of the boiling, smoking tar, I get sick to my stomach. When I'm on the road, I
will pass by or let pass the trucks with the boiling tar trailers because the aroma at that point is at its strongest.
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What IS that smell? They used to re-tar the roof of my school all the time when I was in grade 1 to 5 and it smelled horrendous. Now that's a lasting
memory.
Double, double toil and trouble; Fire burn, and caldron bubble
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#maverick#
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i love the smell of ethyl acetate and ethyl salicylate, NO2(not that im sniffing this stuff just when i get a s scent) hate so2 and HCl and H2S, i
adore the smell of gasoline
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