For an imitation of dove marble, the ground colour must be a bluish-grey, and must lie worked on while it is wet, in the following manner. Provide a little dark blue-grey paint, a little black paint, a little white paint, and a pot containing turpentine. Dip a feather into the turpentine, then into the dark blue-grey, and occasionally into the black. Streak the groundwork with the feather, running always in one direction. Use the white paint in the same way, and put in a few small solid white patches, which should be softened at the edges. When dry, scumble the surface with thin white paint.