This is exactly the thing I'm worried about. I am so scared my SN is actually different substance. I don't really care about purity, I can just increase the dose if the purity is lower. But, I have no way to know/test the SN.
From physical evaluation, my SN is odorless, white-yelowish crystals similar to regular salt. But, it doesn't cause skin irritation. Putting small amount in my mouth doesn't cause anything dramatic.
I was thinking to do other evaluations like measuring mass per volume or even testing its flammability.
If only we know an easy chemical reaction to test it. I think I will study more about it, hopefully I can learn something new.