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Most potent smokescreen chemical?
A very good smoke producer is SO3. This matches well with Bert's remarks above. Even a single drop o ...
21-6-2018 at 22:44
by: woelen
Drivel, split from "Confusion about Aluminium Powder Safety"
More "healing" drivel from D.Orthp.

Detritus
21-6-2018 at 06:21
by: woelen
Sodium Borohydride (NaBH4) For Sale! $0.50/gram
An interesting experiment would be addition of a small amount of solution of copper sulfate to 5% am ...
21-6-2018 at 06:15
by: woelen
Confusion about Aluminium Powder Safety
I would store it in a glass bottle with good seal. Do not add anything else, just use a well-dried b ...
21-6-2018 at 02:07
by: woelen
Rare inorganic Reagents for Sale
[rquote=522361&tid=82812&author=Chemcraft]Hello Wilco

I sent instruction to your email.
...
20-6-2018 at 13:33
by: woelen
Storage of LiAlH4
I think that a little moisture was inside the jar, which slowly reacted with the LiAlH4. The desicca ...
19-6-2018 at 23:54
by: woelen
Bad elements from ebay again
Yes, I know the huge price difference. I purchased red phosphorus, which was sold to me as 98.8% mat ...
19-6-2018 at 23:49
by: woelen
Rare inorganic Reagents for Sale
I tried to place an order on the website, but I could not complete the order. When I needed to selec ...
19-6-2018 at 14:56
by: woelen
Bad elements from ebay again
I found another bad one:

https://www.ebay.nl/itm/100-grams-High-Purity-99-99-Antimony-Sb-Metal-Lu ...
19-6-2018 at 07:11
by: woelen
Mixture of HCl+H2O2 with transition elements
The bubbles at the copper wires are oxygen. This is due to catalytic decomposition of H2O2 by the co ...
17-6-2018 at 23:49
by: woelen
Methylamine question
[rquote=521982&tid=84171&author=PirateDocBrown]Don't answer homework questions. Redirect to ...
17-6-2018 at 10:07
by: woelen
Methylamine question
In order to solve such questions, you need to know the density of a 30% solution, but in this case i ...
16-6-2018 at 10:52
by: woelen
Last chemical order?
I obtained a set of simple vinyl compounds:
- allyl alcohol, CH2=CH-CH2OH
- allyl bromide, CH2=CH- ...
14-6-2018 at 12:18
by: woelen
Extraction of potassium chlorate from old weedkiller
I would convert it to KClO3. Just dissolve all of it in as little as possible of water, allow insolu ...
13-6-2018 at 02:30
by: woelen
How do I recrystallize ferric chloride?
The reason that no FeCl3 from aqueous solution is extracted into an organic layer is due to the ioni ...
12-6-2018 at 05:27
by: woelen
Ferrophosphorus General
There are two types of phosphides.

One type has phosphide ions and has well-defined stoichiometr ...
10-6-2018 at 12:47
by: woelen
Robo challenge event: 2D pattern matching needed
I'm quite limited with choice of hardware. We have to use a Raspberry PI with a standard 5 MP camera ...
2-6-2018 at 13:05
by: woelen
Robo challenge event: 2D pattern matching needed
I also have been thinking of a blinking LED (e.g. at 20 Hz), but this introduces a lot of other diff ...
1-6-2018 at 11:06
by: woelen
Vandium pentoxide substitute
The element vanadium is quite rare and it is not easily purified. The metal also is quite expensive ...
31-5-2018 at 12:07
by: woelen
Robo challenge event: 2D pattern matching needed
Finally, if no beacon is in view, or just part of it, then the software must tell that there is no b ...
31-5-2018 at 11:48
by: woelen
Robo challenge event: 2D pattern matching needed
At a distance of 15 meters (maybe even a little more), the beacon becomes quite small in the image. ...
31-5-2018 at 11:42
by: woelen
Robo challenge event: 2D pattern matching needed
In the run for this post, the robot is much closer to the beacon. It is 3 meters or so from the beac ...
31-5-2018 at 11:37
by: woelen
Robo challenge event: 2D pattern matching needed
The beacon can be represented by the following points:

Plot these in an (x,y)-frame and you see t ...
31-5-2018 at 11:30
by: woelen
Last chemical order?
[rquote=519951&tid=9890&author=Cryolite.]Woelen, are you interested in parting with any of t ...
31-5-2018 at 00:54
by: woelen
Robo challenge event: 2D pattern matching needed
I am organizing a robo challenge event in which mobile wheeled robots (non-holonomous 3-wheeled, two ...
30-5-2018 at 02:15
by: woelen
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