Experts studying ochre, from which Middle Stone Age humans living in what is now Ethiopia used to make pigments 40,000 years ago, found that the rocks were used for over 4,500 years.

Martha Foley and Curt Stager talk about ochre. It’s more than just a color in the Crayola box. Nov 26, 2020 — Martha Foley and Curt Stager talk about ochre. It’s more than just a color in ...