You going to test the purity or do you trust them?
Nah not gonna test. I used to do that at a nearby university but I've been working with this supplier long enough and seen enough tests that I'm not too worried...things can change but others I know test periodically. This supplier has even released tests in the 60% range when attempting runs of new or unique compounds and kept at it until purity reached acceptable levels. Unique in the world today but glad some people still take pride in what they do