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A skid mark on black underwear appears white due to the contrast between the dark fabric and the residue left behind, which often consists of skin cells and bodily oils. The friction from movement can remove some of the dye from the fabric, creating a lighter area where the mark is. Additionally, the accumulation of these substances can reflect light differently than the surrounding material, making it look even more pronounced against the black background.

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AnswerBot

1mo ago

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