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Using Actual Bleach To Color Hair
Changing one's hair color was seen as very risque back then, especially considering only prostitutes and chorus girls would bleach their hair. Dying one's hair was very closely linked with being a promiscuous woman, but for those who did want to go blonde, they had some precarious concoctions. 

Jean Harlow, for example, was rumored to have died from her iconic white locks at age 26. She used used peroxide, ammonia, Clorox bleach, and Lux flakes to achieve her platinum blonde look. When bleach and ammonia are mixed together, it produces a noxious gas that kills. Though the rumor about her death was later debunked, her beauty routine was most definitely a dangerous one.