Iris will know more, but with the powdered pigments, you can mix them with
gum arabic, that's the usual base for watercolors. Watercolors are normally
more successful on paper rather than fabric. Gum arabic is a medium for
watercolors and you can find it in a paint supply place or you might have it
in your box already. Through a suggestion from someone else, I was able to
buy a gallon container of it from a printer - they use it on their machines.
The main thing is to keep trying.
[Non-text portions of this message have been removed]