This is something kids learn to do in school with crayons: a layer of multicoloured patches underneath the black layer on top, and designs etched in with toothpicks or other sharp objects (I used a mechanical pencil - easier to hold and work with). The bright colours underneath show through beautifully.
I tried some Zentangle doodles (again):
My nephews Jaxon and Cooper joined us this week, for some finger
painting fun. Cooper loves to blend colours together, and turn them to
brown.
Jordan is continuing with his sketching. He'll post photos of his finished painting (big spider with face of old man) shortly.