To make the paint, first I had to grind the rocks down into a powder. I used a knife or a small saw on the rock until enough pigment came off.
Some rocks would fall apart instantly because they were so soft, and others took an hour of labor to get enough powder.
Then I crushed those bits in with a little water before adding in gum arabic which is the glue of watercolor paint.
I test the paints quality by making little swatches on paper and let the plate dry in the sun to thicken before scraping the goop into the little square pans for use.
This was a pretty laborious process but it made me appreciate store bought paint so much more, realizing how many years of trial and error is imbued in the tubes of paint we have today.