The purpose of the present invention is to provide a bleaching agent that is capable of quickly and easily decoloring melanin dye from body hair while preventing body hair damage or protecting the body hair. The above purpose can be achieved by using as a bleaching auxiliary magnesium oxide, calcium oxide, a magnesium-calcium composite oxide or a mixture thereof.本發明涉及一種脫色劑。其能夠迅速且簡單地對體毛中的黑色素脫色，並抑制體毛的損傷或實現對體毛的保護。作為脫色助劑，可以透過使用氧化鎂、氧化鈣、鎂及鈣的複合氧化物或這些氧化物的組合物來實現。
