xxxxx - 22-2-2007 at 15:51
with the development of the brightly hued dyes, such as turquois it would seem that there should be a colorfast black dye for cotton. however, upon
sufficent exposure to sunlight most cotton dyes discolor to green or orange. what is the reason that a colorfast black dye for cotton has not been
developed yet?
Ozone - 22-2-2007 at 20:58
"black" is a mixture of several dyes (try mixing some with MeOH and chromatographing it with a coffee filter). The blue dye goes (is degraded) first
on exposure to UV light (rendering it soluble--or it reacts). Washing removes this part revealing the other parts, which tend to be green or
orangish-red (the color balence of black).
one scenario,
O3
YT2095 - 23-2-2007 at 02:09
I`ve had reasonable success using a KmNO4 soln with Wool to make Black, a Pure Black.
it doesn`t wash out or fade either, Perhaps it may work with cotton also?
be carefull not to make soln Too strong because it will denature the material somewhat.
Mumbles - 24-2-2007 at 22:20
I've only been able to get brown from permanganate, though never intentionally. I want to say iodine maybe would be able to give a black, or at least
the illusion of black. Most of my suggestions won't be very organic based. Lampblack seems to stain everything, I imagine a slurry of it in say
sodium hydroxide or HCl might be able to dye some wool or cloth.
You could always rub tar on the shirt 
On a totally unrelated note. I feels good to be back around the forum.
YT2095 - 25-2-2007 at 04:33
it`s quite possible it`s the Amine content in the wool, that makes it work so well, cotton on the other hand wouldn`t have so much of this being Plant
based as opposed to Animal.
it was worth a try anyway 
nightowl52 - 18-3-2018 at 14:06
you need carbon black made to a dye i make carbon black mulch colourant waterbased lasts for 2 years on mulch in the weather in australia