I'm not really much of a shopper but after this morning's round of golf, my father in law and I went to American Science and Surplus. It's a fun store literally full of science stuff and other junk. Take a look at these old shampoos. You can tell they must be old because much of the product has evaporated out of the container. The chemist probably didn't count on needing a 5+ year stability testing.
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Learn more: This topic is covered in depth in our The Complete Guide to Cosmetic Formulation.
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