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Eye primer is a cosmetic product applied to the eyelids before eyeshadow to create a smooth and even base for the eyeshadow to adhere to. It helps to prevent creasing, smudging, and fading of eyeshadow throughout the day, while also intensifying the color and longevity of the eyeshadow. Eye primers typically have a slightly tacky texture to help the eyeshadow adhere better and can also help to brighten the eyelid area and enhance the pigmentation of the eyeshadow.