It's weird that it doesn't have the purity % on the label or on whatever site you bought it from. I don't know much about testing it unfortunately, but I think some people have done blood tests with it to make sure it was the right stuff.
If I remember right, the blood is supposed to turn brown when they mix together. I haven't tried it with mine, so hopefully everything on it was labeled correctly. Maybe I can find a thread with more info and link it here if someone more knowledgeable doesn't show up.
