I did some web search and here is what I
found: Sunlight damages hair just like it
damages skin and the lighter the hair the easier
it gets damaged.
This is a photochemical damage to the
hair shaft that breaks down the sulfur bonds and
the hair becomes fragile. The hair pigments that
are vulnerable to chemical modification by this
photo-bleaching process lose color.
Rearrangements in the pigments molecular
structure changes the way light is absorbed and
A similar effect can be caused by chemical
bleaching by the hair stylist or from chlorine in
a swimming pool by a process called
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