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Whitening may refer to:

• Hypopigmentation, the loss of skin color
• Pallor, a reduced amount of oxyhemoglobin in skin or mucous membrane
• Transforming a signal source to make it appear closer to white noise. See decorrelation, randomness extractor, hardware random number generator
• Key whitening, a technique, in cryptography, for improving the security of a block cipher
• The process of making something whiter
• Part of the leather crusting process

• Disambiguation pages