Jack Acid and Bobby Base meet up for salty doings
Posted by Catherine Cartwright Jones on March 24, 2000 at 09:36:46:
In Reply to: Re: Results of Ammonia on wood posted by Liisa on March 24, 2000 at 09:06:28:
Henna dye is hennotannic acid....ph 5.5 or so. Ammonia is ph 13.5 or
so. Acid + base react ..... and form a percipitate....
In henna .... under the right conditions ammonia will percipitate the
red henna to black. I just use plain, non sudsing, no fragrance
household ammonia. That's 10% ammonia and 90% water. Don't try it
on tender skin, like arms and legs, because it will burn and exfoliate
the skin before it makes the henna black. However, on toughened palms
and soles, I get my henna to go velvet black with henna. Email me if
you want the ammonia rant. For wood and fabric..... ammonia ouchies,
stinkies and stingies aren't a problem like they are in skin.....so go
right ahead!
