Many years ago I was taking some classes about traditional pottery where a lot of attention was given to contact with the earth and sustainability. I remember a few times they told us about traditional painting of those pots with oxides, as a natural method of painting. I never got to the point of really using it in class, but always kept on thinking about what it would be like.
Does anybody have some experience? How does it work?
I imagine they must use minerals for it, but then I wonder how sustainable it is? Also it must depend on which mineral you would use and how much is needed for a little bit of paint?
I was thinking about the technique to make this (picture), other techniques might be interesting too, as long as they are natural materials and do not need a lot of material.
I find that iron oxides are used for red and yellow colours. Charcoal might be used for black and kaolinite for white. I imagine blue can be generated by copper oxides.