Raw chemical storage/separation

[John Wiegerink]

Here's a picture showing what the vapors did to the labels. The bottles had more residue than this. I had already wiped them with a damp paper towel.

If the inside of the lid is truly "foam" that could be the problem. Foam would be the last material I would use to seal out anything. Show us the inside of the lids. There are much better materials than foam for sure. Oh, I store my stuff in an upright 5 shelf cabinet. No problems so far. Knock on wood!

 

[MarkL]

Here's a cap. The material is hard and slippery. It is not like foam at all. I could get all new bottles but I wonder if some kind of material comes in sheet form which I could cut and insert.

 

[koraks]

That looks like it might work OK for stuff like sodium carbonate, potassium bromide and other fairly innocuous powders and crystals. Anything that is prone to oxidization or offgassing/evaporating should not be stored under those lids.

I'd preferably not use them either for anything strongly hygroscopic.

I would not waste time, money and ultimately chemistry on trying to get these to work with stuff like acetic acid, ammonia etc.

 

[Yezishu]

You may also conside some new caps? For Example, https://www.calpaclab.com/28-400-wh...-bonded-ptfe-silicone-septa-each/qp-cap-00343
They have a list of many kinds of Liners:
Caps with Foam Liners
Caps with Foil Liners
Caps with Solid PE Liners
Caps with PTFE Liners
Caps with Rubber Liners
Caps with Vinyl Liners
Cone Lined Caps

 

[MarkL]

You may also conside some new caps? For Example, https://www.calpaclab.com/28-400-wh...-bonded-ptfe-silicone-septa-each/qp-cap-00343
They have a list of many kinds of Liners:
Caps with Foam Liners
Caps with Foil Liners
Caps with Solid PE Liners
Caps with PTFE Liners
Caps with Rubber Liners
Caps with Vinyl Liners
Cone Lined Caps

Excellent, I will measure my thread size.

There are also these on Amazon:

Square Reagent Bottle HDPE Wide Mouth Plastic Bottle, 2 pcs of 500ml Sample Sealing Storage Container for Laboratories, Classrooms, or Storage at Home, LVAM002​

 

[DREW WILEY]

Does anyone know what picric acid might have been used for in printmaking? Two liters of it were discovered last week in an old basement darkroom in a nearby neighborhood, and two entire blocks were evacuated while hazmat and the bomb squad were doing their thing. It's explosive.

It has been used as an etching compound, and sometimes people have used picric acid to make interesting crystal microscope photos; but all the photo chemical bottles they found down there and posted for sake of news coverage look very old, as if some antique method were in play.