Cosmetics can be defined as products or substances that protect or enhance the appearance or odor of a human body. Many cosmetic products include particulate material or emulsions. Some examples of cosmetic products consisting of or including particulates include facial powders, moisturizers, and lipstick. Particle size analysis of cosmetics is used to study formulation, characterize raw materials, perform quality tests on end product, and potentially determine the amount of nano-particles in a product.
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