> As part of a project to develop an alternate gum dichromate
> process, I am looking for commonly available, but unexpected
> sources of pigments... things available from rocks, plants,
> fireplaces, etc., just not out of a tube. Does anyone
> have ideas about what might work?
>
> My experiments to date suggest that it has to be finely powdered,
> non absorbent, densely colored, and capable of going into
> suspension with the colloid (e.g. gum arabic) - whatever
> that entails. Sam Wang (from this list) suggested that
> the ingredients *in* watercolors might be a good place to
> start. Anyone know what they are, and if they are available
> in the sense I describe?
>
> Dan Shapiro
> (dan@lis.stanford.edu)
>
This company has recently changed hands but they have been one of the
primary suppliers for pigments, etc. for some time now. They do a lot of
mail order business. Good luck.
Daniel Smith Ink
4130 1st Ave. S.
Seattle, WA 98134
(206)223-9599