A Complete Collection of 100000 Whys
Fav十万个为什么
为什么头发打湿后颜色变深？
简单的摘要：头发打湿后颜色变深的原因主要是光的总反射减少、头发的透明度增加以及头发表面结构的改变。
1、光的总反射减少：当头发打湿后，毛小皮（头发最外层）的毛鳞片会贴在头发表面，减少了光线的反射和折射，导致头发看起来颜色变深。
2、头发的透明度增加：水会填充在头发的毛小皮之间，使得头发更加透明，这减少了光线的散射，使头发颜色看起来更深。
3、头发表面结构的改变：干燥的头发毛鳞片是打开的，光线在毛鳞片之间多次反射和折射，而打湿后毛鳞片闭合，减少了光线的反射，使得头发颜色变深。
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