The typical stuff used for a really good black is logwood with an additgion of iron tannate and copper salts, however i think logwood may be hard to find but a fairly good black may be obtained from strong black walnut solution. gather hulls and boil them down then put a rusty nail in the soup and let it sit for a couple of days then strain. have you thought about using silver nitrate - toxic but a good black.
-------------- Original message ----------------------
From: Jack Fulton <firstname.lastname@example.org>
> > liz,
> > I have done quite a bit of natural dying for fiber and have a
> > number of sources of herbs, roots , nuts and berries that woiuld be
> > gereeat for anthrotypes.
> > --
> > Peg Fredi
> About 35 years ago I purchased two Ugandan bark paintings: a dark red
> pounded flat bark painted on with some sort of black dye/paint. The
> black color has faded quite a bit and I've thought of using poison
> oak juice to 'repaint' the geometric
> design. Do any of us know of other natural dyes to produce a nice
> black . . if you would like to see more I can send anyone a small
> JPEG of the painting, which is about 30"x50"
> The post by Peg above made me ask . . sorry if it is a bit off-topic