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i can tell you exactly how they get their hair to be blue though, and why they do it (probably. i assume it's not out of vanity but old people are crazy, after all.)
i assume that most people wash their hair with tap water, which can yellow blonde or white hair. it's just like when you bleach your hair and it turns yellow, you have to put toner in it to take the yellow out. toner is sort of a lavender color and if you leave it in long enough it will turn your hair bluish.
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