What is a good way to store something like flash powder? I keep getting paranoid and worrying about it igniting spontaneously due to bad sulfur or something while i'm at work. Right now it's in a paint can.

I just use Plastic Containers... It should be fine in a Paint Can though if its clean and not rusty I just use plastics due to an irrational fear of sparks...

Common sense would tell you not to store compositions, for obvious reasons. Otherwise plastic should be fine, and obviously not in your room(ideally not your property, but whatever).

Make sure they wont react with each other when exposed to a small amount of heat, or produce fumes which might rupture a weak container.

Should it have an exhaust hole so that it doesn't explode if the chemicals do start reacting?

Storing any pyrotechnic substance in a metal container isn't a very good idea... unless its a solvent... unless your storing black powder in one of those excellent old stainless steel powder kegs.

If your going to store compositions... store them in plastic containers, preferably ones where the action of putting the lid on and off creates very little friction. In addition, it might be wise to tape or otherwise secure a packet of dessicant to the inside of the lid of the container to keep everything dry.

... BUT... don't store flash.

Just make it as needed, it takes so little time and then you have so much less to worry about.

Paper bag in a tupperware box with silica gel, add a can of static guard if you're paranoid and you're all set.

No sparks, no static, no shrapnel, no treads, dishwasher safe.

the best way to store FP? Separately. One plastic container of oxidizer, and one plastic container of metal powder. weight out however much you need, diaper-mix it, and you're done. fresh flash in 60 seconds flat, and no storage issues.

Paper bag in a tupperware box with silica gel, add a can of static guard if you're paranoid and you're all set.

No sparks, no static, no shrapnel, no treads, dishwasher safe.

This. I was about to say tupperware containers.

NO!!

Follow this rule or you will fuck up,

only make when you are going to use.

omwyagtu

plastic can generate static,

HDPE containers for big storage fiml canisters for small storage ...

As already mentioned, plastic containers can still generate static electricity, metal containers/glass containers will be dangerous if your composition explodes. It's 10x safer to store the ingredients separately (although metal powder can combust, it just needs a lot of heat) and just mix them when you need them.

Store the containers grounded to something metal to let the static discharge through it?