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Although Thiuram Mix can be found in a variety of common products such as rubber and pesticides, it is not typically listed as an ingredient in cosmetics. In fact, Cosmetics and sunscreens are often cited as allergens in contact dermatitis studies, but not as sources of Thiuram Mix. Therefore, C is the only option that is not commonly listed as a source for this test substance according to the North American Contact Dermatitis Group.