Ancient Egyptians used eyeliner made from a mixture of lead, malachite, and kohl, not only for cosmetic purposes but also as a form of sun protection.
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Eye creams are often formulated with a higher concentration of active ingredients than face creams, because the skin around the eyes is thinner and more delicate.
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Facial serums are often lightweight and quickly absorbed because they have a higher concentration of active ingredients and a lower concentration of water than other skincare products.
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