Heliotrope.
—This colour is obtained by using two parts of zinc white, three of bright red, and four of ultramarine blue.
Implement Blue.
—This is made simply by mixing ultramarine with white. Barytes and zinc mixed are frequently used for the white, as lead cannot be employed in the presence of ultramarine.
Indigo.
—This dark blue is, of course, a natural vegetable pigment. An imitation may be produced by using nine parts of black and four of Prussian blue, but this will not look like the real thing. Indigo should not be mixed with lead or lead chromates.
Lavender.
—Three parts of ultramarine blue and one part of carmine, added to zinc as a base, give a very good lavender tint for inside work. Ivory black mixed with a little carmine and ultramarine and added to white lead may be employed for outside work.
Light Blue.
—This is simply an ultramarine blue tint produced by the addition of zinc. Or the colour may be obtained by tinting white lead with Prussian blue.