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Posted by Catherine Cartwright-Jones on February 2, 2004 at 08:47:17:

In reply to: How henna highlights happen posted by Pierre on February 1, 2004 at 21:42:37:

Not quite. Henna does not coat your hair, no matter what the
textbooks say. Some writer got it wrong about 100 years ago, and
they've repeated the same mistake every edition instead of looking
farther. (grrrrrrrrr)

When you see hennaed hair, you're seeing two things. YOu see the
color of the hair that is in the core of the hair shaft. You see the
stained keratin scales on the outside of the shaft. Imagine looking
at a red-orange translucent textured plastic glass full of root beer
(proxy for brown hair). If you take that glass into the sunshine, the
sun will bounce off the red-orange plastic with an orange shimmer.
Indoors, the light is less bright, so there's less to bounce off the
hair and create the orange dazzle, so you see and the root beer color
more.

Henna binds with the keratin in the scales and makes them smoother,
harder, stronger. When they are smoother, harder, stronger, they
reflect more light, like something that's been polished. So, when
your hair is hennaed, more of the light bounces off your hair, and it
bounces off in an array of angles. The bounce is coming off the sleek
scales stained with henna, so the bounced light is red. The light
reflected from the melanin within the hair core is obscured. Indoors,
with less light ... particularly with orange-y light bulbs, you don't
see the red-orange shimmer, you see the darker color.

I have GOT to get that section illustrated and uploaded! I'll get to
use the word albedo somewhere. I like the word albedo.

Follow Ups

That's the fascinating part of henna Fia 11:44:21 2/2/2004 (0)
what about indigo? iris 09:10:19 2/2/2004 (3)
- Re: what about indigo? Catherine Cartwright-Jones 10:34:12 2/2/2004 (2)
  - Re: what about indigo? Monica Tittle 14:47:26 2/2/2004 (1)
    - Re: what about indigo? Catherine Cartwright-Jones 17:28:11 2/2/2004 (0)

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: Not quite. Henna does not coat your hair, no matter what the : textbooks say. Some writer got it wrong about 100 years ago, and : they've repeated the same mistake every edition instead of looking : farther. (grrrrrrrrr) : : When you see hennaed hair, you're seeing two things. YOu see the : color of the hair that is in the core of the hair shaft. You see the : stained keratin scales on the outside of the shaft. Imagine looking : at a red-orange translucent textured plastic glass full of root beer : (proxy for brown hair). If you take that glass into the sunshine, the : sun will bounce off the red-orange plastic with an orange shimmer. : Indoors, the light is less bright, so there's less to bounce off the : hair and create the orange dazzle, so you see and the root beer color : more. : : Henna binds with the keratin in the scales and makes them smoother, : harder, stronger. When they are smoother, harder, stronger, they : reflect more light, like something that's been polished. So, when : your hair is hennaed, more of the light bounces off your hair, and it : bounces off in an array of angles. The bounce is coming off the sleek : scales stained with henna, so the bounced light is red. The light : reflected from the melanin within the hair core is obscured. Indoors, : with less light ... particularly with orange-y light bulbs, you don't : see the red-orange shimmer, you see the darker color. : : I have GOT to get that section illustrated and uploaded! I'll get to : use the word albedo somewhere. I like the word albedo.
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