The next experiment (check out the first experiment and second experiment in the series) involves using white india ink as a resist. The following were drawn with .8mm nib Rapidograph technical pen and Doc Martin's Bombay White india ink.
1. Doodled on a 35mm color slide case and film with white ink, then painted with watercolors, pressed a paper towell to absorb the extra, then painted again, repeated this process about 5x. The slide case did not absorb much paint, so there is less contrast than expected.
2. Attempted to draw a mandala in white ink in a watercolor moleskine journal. Not sure what on earth I was thinking because white on white is almost impossible. I was drawing blindly. I painted wavy watercolors with a brush, dabbing the excess with a paper towell, repeating a few times.
India ink clearly works as a resist, just need to refine the process.