When you make your own bath and body products (including your own mineral make-up) and the recipe always calls for cosmetic grade colorant. And you are wondering what does cosmetically grade colorants mean? Then I would recommend checking out this article I found on the Pixie Lee Soap Forum about Oxides, Ultramarines and Micas. It should answer all of your questions about these various colorants.
http://www.newdirectionsaromatics.ca/documents/labcolor/labcolorcosmeticgrade.doc
http://www.newdirectionsaromatics.ca/documents/labcolor/labcolorcosmeticgrade.doc
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