hmmmmmmmmmmmm

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Posted by khoa on August 1, 2001 at 16:00:46:

In reply to: black Henna posted by Barrowboy on August 1, 2001 at 10:38:11:

Hmmmm....this is a real tuffy, because we cannot know for sure
whether or not ppd or any other chemicals were used. Even though
black acid was listed as the blackening agent it would not transform
the hennatonic molecules to black. older skin cells are permeable to
hennatonnic acid, but are impermeable to many many other substances,
in fact most food dyes are impermeable. So osmosis cannot occur if
the particles are too big to permeate the cells. i would stay away
from it, (the black henna, and the previous science lesson) who know
what was added to make it black.

 

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