Hey, been out of the real chemistry for a long time so pardon my beginner question:
I am importing natural herbs and other ingredients from overseas. The claim ius tht they are "organic" and "all-natural" ie 100% pure.
What chemical tests can I do on the ingredients (indigo leaf powder for hair, henna powder) to ensure that
1) no metallic salts are added
2) they are truly organic
The place has certifications but I want to be SURE.