Blue rinse
From Infogalactic: the planetary knowledge core
A blue rinse is a dilute hair dye used to reduce the yellowed appearance of grey or white hair, typically associated with older women.[1][2] In a manner similar to laundry bluing, the blue rinse can make yellow-white hair appear blue-white.[citation needed]
The blue rinse gained popularity after Jean Harlow's appearance in the 1930 film, Hell's Angels.[1][2] Queen Elizabeth also contributed to the popularity of the blue rinse in the 1940s.[1][2]
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