In order to make the color pencil its most vibrant and sink deeper into the paper withiout making the paper curl. I use a paintbrush, odorless paint thinner and a towel to blot and clense the brush with. First, I make many light layers of color, crosshatching and one on top of the other. I suggest a minimum of 5 - 8 layers at a light to medium pressure to start with. Then using a brush according to the size of your details, dip the bristles into the paint thinner. Brush slowly, as the thinner dissolves the wax and will release the pigmints to sink deeper into the crevaces of the paper. Dont clean your brush but return back to the top and do the same stroke again with more pressure on your brush to widen your line and release the pigment.