Food Grade SN

[Nikitatos]

If the SN 99% pure, does it matter if it has a "food grade" label on it? Or is the purity all that matters?

 

[andreamysk]

If the SN 99% pure, does it matter if it has a "food grade" label on it? Or is the purity all that matters?

Yes, the percentage is the main issue. "Food grade" should theoretically mean "compatible with human consumption" i.e. free of non-toxic substances (obviously in minimal quantities, since SN is used as a food preservative)