ART PRINCIPLES IN PORTRAIT PHOTOGRAPHY
quently a soft bristle brush will help to play out the gradations satisfactorily.
If strong blacks are desired in such passages, a cloth dipped in alcohol may be passed over the spot, removing the medium entirely. The same method will increase the depth of the eyes. For instance, if over the face, hair, and other parts of the picture Medium B is applied, causing a greater general density, and if the eyes are touched by a brush dipped in alcohol to clear away the pigment, the print will show eyes possessed of greater depth, but not in the least changed in the drawing.
In applying Medium B the brush stroke should have decision. If perchance too much medium has been used, we do not alter the shape of the stroke, but remove the surplus by pressing on it the royal blotter; when this is lifted it carries with it the excess of paint. We can add to the delicacy of stroke by patting it with the palm of our hands, as already de scribed. In that way its margins keep their character and the intention is preserved.
When it is desired to have the whole area lighter, we paint with the brush such gradations as are wanted, then we arrive at the right densities by using a silk pad and patting the surface. Velvet is preferable at times.
A clean flat camel's-hair brush will soften the edges
of the stroke, and a clean flat bristle brush can be used