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Author: Subject: Crystal Growing
Cathoderay
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[*] posted on 21-9-2023 at 16:46


I have heard of coating the inside of the container with wax.
Don't let the solution get between the wax and the container though.
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yobbo II
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[*] posted on 22-9-2023 at 06:01



Perhaps an untra-violet light would help with the microbes?

Yob
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SnailsAttack
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[*] posted on 22-9-2023 at 21:11


Quote: Originally posted by knowledgevschaos  
A few people seem to have trouble with a crust of crystals creeping up the edges of the container. I've had this problem too, particularly with copper sulfate. My theory is that this happens because the meniscus on the glass draws the solution up into a thin layer that evaporates more rapidly.
Yeah, I think it's a capillary pumping effect. NaCl and NH₄H₂PO₄ do it, and the puffy white crystals formed by Ca(CH₃COO)₂ seem to be dictated almost entirely by this effect, although it manifests very differently than with the previous two salts.

Quote: Originally posted by knowledgevschaos  
I think that by rubbing the glass with an oil / petroleum jelly, the container would repel water, and this wouldn't be a problem. I haven't been able to test this yet though.
Huh, I might give that a try as well.

Quote: Originally posted by knowledgevschaos  
Solutions going moldy also seems to be a problem for many compounds, especially sugar and rochelle salt
I've had potassium bitartrate go moldy; no surprise that rochelle salt would do it as well.

Quote: Originally posted by knowledgevschaos  
.. and I think it could happen to ammonium dihydrogen phosphate too.
I've spent months recrystallizing some monoammonium phosphate that had a bunch of food dye in it and it's never grown mold; that's not to say it couldn't happen, though.

Quote: Originally posted by knowledgevschaos  
I've even had magnesium sulfate grow microbes (how an organism can thrive in a saturated MgSO4 solution is beyond me!).
Yes, this happened to me as well, except mine was also incredibly alkaline. Posted about it here. The replies are very interesting. Thread is illustrated nicely by Mayko and Metacelsus:
Quote: Originally posted by mayko  
tied for first: these crudlings, surviving in the face of impressive osmotic stress and feeding on ... ?
files.php.jpg - 9kB
Quote: Originally posted by Metacelsus  
Life, uh, finds a way.




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Sir_Gawain
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[*] posted on 4-11-2023 at 14:15
Nickel Sulfate Crystal


This one took about a month and a half.
IMG_6429.JPG - 736kB

IMG_6431.JPG - 670kB

It's actually much more green than the camera shows.




“Alchemy is trying to turn things yellow; chemistry is trying to avoid things turning yellow.” -Tom deP.
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DraconicAcid
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[*] posted on 4-11-2023 at 14:16


Wow!

Don't put nickel compounds on your skin.




Please remember: "Filtrate" is not a verb.
Write up your lab reports the way your instructor wants them, not the way your ex-instructor wants them.
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Sir_Gawain
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[*] posted on 4-11-2023 at 14:20


Yeah, I washed thoroughly afterward.



“Alchemy is trying to turn things yellow; chemistry is trying to avoid things turning yellow.” -Tom deP.
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Eithern
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[*] posted on 22-11-2023 at 13:59


Quote: Originally posted by knowledgevschaos  

A few people seem to have trouble with a crust of crystals creeping up the edges of the container. I've had this problem too, particularly with copper sulfate. My theory is that this happens because the meniscus on the glass draws the solution up into a thin layer that evaporates more rapidly. I think that by rubbing the glass with an oil / petroleum jelly, the container would repel water, and this wouldn't be a problem. I haven't been able to test this yet though.


Guys I had the same problem recently with ammonium nitrate, what do you think about using non-stick pans as crystallization dishes?
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knowledgevschaos
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[*] posted on 29-11-2023 at 02:12


I think that would work, as far as I know teflon repels water. What was your goal with the ammonium nitrate? It isn't a material usually used to grow crystals, and I'd be curious to know what the crystals look like.
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