Paint & Colour Mixing / A practical handbook for painters, decorators and all who have to mix colours, containing 72 samples of paint of various colours, including the principal graining grounds

by Arthur Seymour Jennings

Purity of Tone.

—Some remarks on this subject will be given under the heads of the various groups of colours. Speaking generally, the richness of brilliancy of tone is easily discernible by placing the sample to be tested side by side with another of well known excellence. In siennas, ochres and umbers the selection of crude material by which the richness of tone is assured is of great importance.