Below is a painting that needs one more color layer to be "finished." It already has a layer of yellow-orange under a layer of cadmium red. Below a blue color (phtalo blue mixed with purple and burnt umber) is being rubbed into the textures.
I use paper towels to smooth each color layer before I begin removing paint from selected areas.
In the following photo please notice the multicolored rag - it has been used to remove many colors from many areas.
In the formal photograph below, you can see that the blue color has been removed from many areas.