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Fyndium
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Did you produce this yourself? If, how did you packed and sealed it?
Meanwhile, cleaning and drying a small batch of acetone.
[Edited on 22-9-2020 by Fyndium]
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Lion850
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Cobalt formate crystals forming as the solution cools
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arkoma
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Rounded up eight old school mercury switches:
Yield of mercury:
 
I didn't have any mercury, so this was a cool find!
"We believe the knowledge and cultural heritage of mankind should be accessible to all people around the world, regardless of their wealth, social
status, nationality, citizenship, etc" z-lib
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MidLifeChemist
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some Lead Iodide from yesterday
[Edited on 2-10-2020 by MidLifeChemist]
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mayko
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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!
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
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. 
Attachment: Espagne et al. - 2004 - Genome sequence of a polydnavirus Insights into symbiotic virus evolution.pdf (189kB)
This file has been downloaded 397 times
It also turns out there is a second wasp which parasitizes the first, a situation called hyperparasitism. It's a hyperpest!!
al-khemie is not a terrorist organization
"Chemicals, chemicals... I need chemicals!" - George Hayduke
"Wubbalubba dub-dub!" - Rick Sanchez
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CharlieA
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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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arkoma
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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.
"We believe the knowledge and cultural heritage of mankind should be accessible to all people around the world, regardless of their wealth, social
status, nationality, citizenship, etc" z-lib
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B(a)P
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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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Am I the only one who gets breaking bad vibes from these CaCl2 hexahydrate crystals? 
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Bezaleel
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Wow, looks like solidifying raspberry syrup. Yummy!
Is cobalt formate hygroscopic, or could you grow crystals from it?
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Bezaleel
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I just love these for their colour
Cobalt(II)orthomolybdate (left) and molybdatocobaltate(III) (right)
 
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Fyndium
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Recrystallization is always mesmerizing to watch.
https://vimeo.com/470354647
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arkoma
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My lab space represents!
"We believe the knowledge and cultural heritage of mankind should be accessible to all people around the world, regardless of their wealth, social
status, nationality, citizenship, etc" z-lib
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Lion850
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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!
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Herr Haber
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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
 
[Edited on 24-10-2020 by Herr Haber]
The spirit of adventure was upon me. Having nitric acid and copper, I had only to learn what the words 'act upon' meant. - Ira Remsen
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j_sum1
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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.
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Tsjerk
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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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Herr Haber
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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 ?
The spirit of adventure was upon me. Having nitric acid and copper, I had only to learn what the words 'act upon' meant. - Ira Remsen
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Tsjerk
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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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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.
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nice! how much calcium is that?
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j_sum1
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| 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.
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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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j_sum1
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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.
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Lion850
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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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mayko
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handsome lil borax crystal
al-khemie is not a terrorist organization
"Chemicals, chemicals... I need chemicals!" - George Hayduke
"Wubbalubba dub-dub!" - Rick Sanchez
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CharlieA
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[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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