How can blonde tell when they're startin to hv white hair?

some blondes hv such light hair that it almost looks white



for example, look at this icelandic girl on ryt:



http://www.icelandtouristboard.com/graph/abouticeland-children.jpgHow can blonde tell when they're startin to hv white hair?
blonde hair almost always gets stained a more yellowish tint by the time the person is middle aged (even if they've been a really light headed blonde all their life, it still darkens somewhat). Therefore; it's a bit more difficult to tell compared to someone who, for example, has black hair which contrasts more sharply with white.



you can still somewhat tell when the hair is white by close inspection, but it's not as noticeable.... but it's still there...How can blonde tell when they're startin to hv white hair?
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