Help SN Storing and Purity?

[Sicherung231]

So I finally got my SN (99+%) but now I'm unsure about how to store it?

I've also made the accident of deciding to open the lid to see inside and I'm not sure me opting it makes the shelf life worse or not?

And lastly how should I check it is *true* SN at the written purity?

 

[pedro3211]

Ideally you should test your SN using a test strip or reagent kit if you're curious about purity. I'd advise keeping SN stored in a cool dry place. And keep the lid close as much as you can