Are you familiar with the Inktense Water Soluble Ink Pencils and Blocks by Derwent? They are similar to watercolour pencils but with a significant difference. When you add water, Inktense pencils and blocks produces ink and not watercolour paint. Once it has dried, the ink is waterproof instead of remaining water-soluble like the watercolour ones.
As a result you can add layers of different colours to your work, whether it's on paper or fabric. For more information, go HERE. Check HERE for a fabric painting demo using the Inktense pencils.
I have both the pencils and the ink blocks. At the moment, I'm doing a bit of research on them (I've had both for awhile but just did not take the time to do any experimenting). The time has come . . .! The embroidery machine is working away downstairs so something productive is happening.
I just viewed a short video clip on printmaking with Intense Blocks. I can see potential with that method!
Check out these images using the Intense Ink Pencils and Ink Blocks.