#117024. Asked by star_gazer. (Aug 26 10 12:30 PM)
This is done to make the grey hair appear to have less of a yellow tinge. This yellow tinge may be actual (e.g., caused by smoking) or just perceived by aging eyes which are less able to see the blue end of the spectrum - in this case, increasing the amount of blue restores the 'normal' balance. It may also be related to the 1930s (popularised by Jean Harlow) practice of using peroxide to bleach hair, followed by a blue rinse to produce a platinum white effect rather than yellow.
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