Mis with water to the consistency of ordinary paint, lampblack, whiting, and a little ultramarine with size to bind the ingredients. Endeavour to produce a good neutral tint. To obtain a shaded effect, use a large brush and work as quickly as possible, lightening the tint as the work proceeds. If the shading is done while the work is wet the shadows blend well together, and all hard lines are prevented. Some workers hatch over the background and afterwards put in clouds with a blunt charcoal point. It has also been proposed to mix the colours very thin, and apply them with .a, watering pot. So Long as the masses oi Light and shade and the prespective are correct, and objects are not too distinct, the painting need not be verj carefully done. Paper backgrounds may be purchased very cheaply, so unless some special design i- required it is ch buy the ready-made article.