response: They bleached it through washing it in lime. Then they comb it back from their foreheads.
original_response: They bleached it by washing it in lime and combing it back!  Crazy to think of that happening so long ago.
history: I just dyed my hair light purple. I am really excited about it! Neat, hair coloring can be done at home or by a hairdresser, which way did you go? I went to a hairdresser to have it done. Cool, the Celtic people was described by Diodorus Siculus, a Greek Historian, to have dyed their hair blonde. That's really cool! How did they manage that?
knowledge: Their hair is blond, but not naturally so: they bleach it, to this day, artificially, washing it in lime and combing it back from their foreheads.