pigment

[smolders]

I was watching a how to vid on painting on youtube the other day, the fellow used pigment..I assume that is a dry powder type material that has colour... it was used to deepen shadows in the flesh on the figure a rather pleasing effect I found and would like to try it out....could I use pastels ground up and applied with a brush that help in place with clear coat after? or is there another way to do this?
Thanks in advance