Working with Natural Pigments

I have been working with natural pigments again recently, all the more encouraged by being able to buy an all natural acrylic medium to bind the pigments ready for use.
The pigment below was made by gathering a little of the rubble used in our un-made road to fill the potholes. I was interested in how it crushed easily as the cars ran over it. I must discover what mineral it actually is!

After crushing it in a pestle and mortar and putting through a very fine sieve I was able to combine it with the medium and produce a very usable colour.

Here are two pieces of work I’ve made using found and ground natural pigments.
Ochres and oxides, lichen and the pigment above.

Series – Yellow and Turquoise

Another thing I like at the moment is working across several pieces at one time. Taking the colour from one to another has a kind of flow to it so doesn’t break my concentration, each surface primed and ready before I start. These are made with Acrylic paint, charcoal and pastel on a variety of substrates.