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Author: Subject: Pretty Pictures (2)
Fyndium
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[*] posted on 22-9-2020 at 03:12


Quote: Originally posted by Pok  
Pure hydrogen cyanide


Did you produce this yourself? If, how did you packed and sealed it?

Meanwhile, cleaning and drying a small batch of acetone.





cleaning.jpg - 1.9MB

[Edited on 22-9-2020 by Fyndium]
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Lion850
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[*] posted on 22-9-2020 at 16:15


Cobalt formate crystals forming as the solution cools

F7B39C11-DB82-4AF2-B4F0-359D2576D51A.jpeg - 2.4MB
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arkoma
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[*] posted on 27-9-2020 at 10:22


Rounded up eight old school mercury switches:

IMG_20200927_130636_068_hdr.jpg - 128kB

Yield of mercury:


IMG_20200927_131212_152_hdr.jpg - 165kB IMG_20200927_131358_989_hdr.jpg - 159kB

I didn't have any mercury, so this was a cool find!




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MidLifeChemist
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[*] posted on 2-10-2020 at 08:57


some Lead Iodide from yesterday



[Edited on 2-10-2020 by MidLifeChemist]

lead-iodide3-1.jpg - 541kB
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mayko
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[*] posted on 2-10-2020 at 13:39


These were sights for sore eyes to me... I'd been fighting a losing battle against tomato hornworms in my garden. The little monsters are devastating! Things turned around when I learned that they're actually fluorescent under ultraviolet light. I can go out at night with my uv flashlight and just pick them off the plants!

glowingHornworm.jpg - 45kB

I don't kill all of them, though. I found a couple that were completely still and had these white things sticking out of their backs. It turns out those have been parasitized by a specialist wasp. Since they're no longer chomping and they're hosting beneficial insect predators, these can stay

InfectedWorm.jpg - 73kB

The more I looked into this wasp the weirder things got. Apparently it actually carries an endogenous virus in its genome, which it uses to infect the caterpillar as part of the parasitic process. Most of the time a virus genome is compact to the point of heavy overprinting, but this virus contained not only considerable noncoding sequence, but also introns! This, and a few other odd facts have led to the idea that it might actually be a new virus in the process of emergence, rather than an ancient insertion. :o

Attachment: Espagne et al. - 2004 - Genome sequence of a polydnavirus Insights into symbiotic virus evolution.pdf (189kB)
This file has been downloaded 29 times




It also turns out there is a second wasp which parasitizes the first, a situation called hyperparasitism. It's a hyperpest!!







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CharlieA
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[*] posted on 2-10-2020 at 16:31


Quote: Originally posted by arkoma  
Rounded up eight old school mercury switches:


I bought a bunch of small switches ("tilt" switches, maybe) some time ago, but I haven't decided how I want to break them. I suspect I'll get more powdered glass than Hg!
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[*] posted on 2-10-2020 at 23:05


I cracked them on one end, held down in a beaker, with a pair of pliers. The bits of glass that fell in with the mercury was no problem, as it doesn't "wet". The mercury poured off clean.



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B(a)P
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[*] posted on 2-10-2020 at 23:55


I find if you hold them by the wire connections, with the wire connections pointing down. Then use side cutters to take the to off. Then pour the mercury into you breaker. I have opened many switched and this has always worked well.
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Fyndium
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[*] posted on 13-10-2020 at 08:07


Am I the only one who gets breaking bad vibes from these CaCl2 hexahydrate crystals? :cool:

cacl2.jpg - 448kB
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Bezaleel
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[*] posted on 15-10-2020 at 14:23


Quote: Originally posted by Lion850  
Cobalt formate crystals forming as the solution cools

Wow, looks like solidifying raspberry syrup. Yummy!
Is cobalt formate hygroscopic, or could you grow crystals from it?
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[*] posted on 15-10-2020 at 14:41


I just love these for their colour

Cobalt(II)orthomolybdate (left) and molybdatocobaltate(III) (right)

20201015_144852_detail.jpg - 615kB 20201015_144946_detail.jpg - 724kB
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[*] posted on 20-10-2020 at 13:52


Recrystallization is always mesmerizing to watch.

https://vimeo.com/470354647
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[*] posted on 20-10-2020 at 14:12


My lab space represents!

IMG_20201020_170801_261.jpg - 406kB




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[*] posted on 22-10-2020 at 20:19


Red crystals of what is supposed to be ammonium pentachloroferrate forming as the solution cools. Plan is to let the beaker cool slowly on the cooling hotplate overnight and to see whether I can recover dry crystals tomorrow. No idea if these are stable or hygroscopic. Will soon see!


136E9DFD-2A29-45CF-9B70-0975998BBA81.jpeg - 3.3MB
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Herr Haber
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[*] posted on 23-10-2020 at 20:38


Having uranium glass, fluorescein and a black light source I HAD to do it...

The decanter is full of fluorescein. So is the glass at the upper right corner. The one right below is empty.
The three other glasses were filled with drinks suited to the era this glass was made :)
From left to right: Absynth, Absynth with water, Chartreuse.
(Yes, I used to smoke cloves and listen to The Cure)

The second picture is the decanter and the shot of fluorescein.
Closer to the light source they just saturate the sensor

IMG_3301.JPG - 95kB IMG_3302.JPG - 49kB

[Edited on 24-10-2020 by Herr Haber]




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[*] posted on 23-10-2020 at 22:41


I bought some calcium years back. But I never had occasion to open the tin. However, with the tin showing signs of age and one of my students asking questions, I figured it was time for an unboxing. And to pop those babies under some oil.


IMG20201024162926.jpg - 2.9MB
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[*] posted on 24-10-2020 at 02:37


Herr Haber, nice pictures! Maybe you would find it interesting to see if you can show fluorescerent quenching. When the concentration of a fluorescerent molecule goes over a certain threshold, the fluorescence won't plateau, but actually go down because the dye will start to quench itself.
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[*] posted on 24-10-2020 at 08:42


Interesting idea.
I can see the difference between the glass and the dye but it's not as visible in the pictures. In the second one I diluted the original concentration to about 1/4th. That's what you see in the second picture but they are also closer to the light source.
I was thinking I would try to dilute more. I dont know much about optics but found interesting that my 1W blue laser would totally scatter. Not even a hint of blue on the other side of the decanter because of the dye.

Maybe I should try your suggestion in a beaker so the threshold is more visible when I make additions ?




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[*] posted on 24-10-2020 at 11:32


You could make a dilution series indeed and check when the fluorescence goes down with rising concentration. It shouldn't take a lot.
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MidLifeChemist
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[*] posted on 24-10-2020 at 14:21


Quote: Originally posted by j_sum1  
I bought some calcium years back. But I never had occasion to open the tin. However, with the tin showing signs of age and one of my students asking questions, I figured it was time for an unboxing. And to pop those babies under some oil.


nice! how much calcium is that?
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[*] posted on 24-10-2020 at 20:09


Quote: Originally posted by MidLifeChemist  
Quote: Originally posted by j_sum1  
I bought some calcium years back. But I never had occasion to open the tin. However, with the tin showing signs of age and one of my students asking questions, I figured it was time for an unboxing. And to pop those babies under some oil.


nice! how much calcium is that?

115 grams. It is pretty light stuff. And hard. Not sure what happens when I want a small piece.
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[*] posted on 24-10-2020 at 22:55


On a similar theme,
Lion850 arranged for me to score this little jar at a bargain price.
It is somewhat affected by air but a bit of hydrocarbon will prevent that from being an ongoing problem.
Standard size reference is given. There is also a lump of lead in there to keep it from floating.


2020-10-25 15.45.02b.jpg - 534kB

2020-10-25 15.45.28.jpg - 2.6MB
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Lion850
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[*] posted on 25-10-2020 at 01:20


j_sum1 I like the "Standard size reference"; indeed universal hahaha.

I visited the supplier yesterday to get some thiourea; I meant to ask if he has more lithium but forgot.
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[*] posted on 26-10-2020 at 16:02


handsome lil borax crystal

borax.jpg - 69kB




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[*] posted on 26-10-2020 at 16:30


[rquote=647265&tid=26378
...I visited the supplier yesterday to get some thiourea... ...
[/rquote]

Out of curiosity, what would 10-50g of thiourea, shipped to the US, cost?
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