Answer: bleaching

AnswerCrossword Clue
BLEACHINGWhitening.
BLEACHINGProcess of whitening.
bleachingClean and sterilize
bleachingDeprive of vitality or substance
bleachingWhiten by exposure to sunlight or by a chemical process
bleachingBLEACH, to whiten (to make white (the colour of pure snow))