I made my own oil paint from rocks that I found around Bellingham, WA. I ground the stones by hand using a mortar and pestle.
The rocks themselves were red but the paint that I made from them was more of a warm brown.
I love the look of this earth paint. It has a soft burnt umber hue and adds wonderful texture. Now I want to make more. I'll be on the lookout for colorful clay and rock.