"Blindly?" Are you such a genius that you can somehow magically confirm the purity of SN through a thumbnail? Are you seriously stupid enough to blindly believe labels? Also don't be so pathetic that you need to try and take credit for Vizzy's knowledge.
Yes you can. If it's from a legitimate place.
Even if it doesn't have the exact purity.
It needs to have a
UN #
OR A
CAS Registry #
The way your OP sounded is like you already bought and and needed it tested.
If you're buying from a sketchy source then of course aqua strip or blood test. Which have both been mentioned on many threads other than this one.
No one's being pathetic it was simply saying vizzy gave good links.
Don't name call and next time use the search function. To question thats already been answered 100s of times.
Good luck. And glad some people have also linked some valuable information.