Importance of Pure Tints
I think it is a very important thing in all decorative work to keep one's colours pure in quality, and to avoid muddy or heavy tints. Brown is an especially difficult colour to use, because of its generally heavy effect as a pigment, and the difficulty of harmonizing it with other colours except as an outline; and even here it makes all the difference whether it is a cool or a hot shade. A hot brown is most destructive of harmony in colours. It is safe, as a rule, to make it lean to green, or bronze, or gold.
As a general rule it is well to work either in a range of cool tints—a cool key of colour, or the reverse—a warm and rich one. Few cool harmonies can be better than ultramarine and turquoise on greenish white, of which the Persians and Indians are so fond in tile-work. They are delightful to the eye, while peculiarly adapted to the work, owing their quality to the oxide of copper, which the firing brings out so well.
Blues and greens and grays, relieved with white and yellow and orange: or, reds and yellows, relieved with white and opposed by blacks, generally answer: or a range of reds together, or range of blues, or of yellows, with black and white for contrast and accent. Blue and white, too, can be modified in quality; black may be greenish in tone, or brownish, bluish, or purplish according to the harmony aimed at. White may be pure or ivory-toned, cream-coloured or influenced by other colours, and should vary in degree according to the strength of the harmony. This brings us to the question of tone.
Tones and Planes
Now the ornamentist, the designer of patterns, relies for his effect upon the use of certain planes and oppositions of tints to relieve and express his design, to emphasize its main motive, to bring out or to subdue its lines and forms. He knows that cool flat tints—blues, greens, grays—will make forms and surfaces retire, and he makes use of them for flat and reposeful effects, such as wall and ceiling surfaces, adopting the natural principle of colour in landscape and sky.
He uses richer and more varied colour in textile hangings and carpets, furniture, and accessories—reds, yellows, greens, crimson, russets, orange, gold—which answer to the brighter flowers and parterres of our gardens, as things to be near the eye and touch, and to occur as lesser quantities in a scheme of interior colour design.
In the colour design of patterns, harmonious and rich effects can be produced by the use of pure colour alone, no doubt, if carefully proportioned, and separated by outline; though harmony is more difficult to attain in pure colours used in their full strength; and for their due effect, and to avoid harshness, such a treatment really requires out-door light or special conditions of lighting, or the strong light of eastern or southern countries, to soften the effect.
And since we have to adapt our designs to their probable surroundings, we usually consciously select certain tones or shades of a colour, rather than use it absolutely pure or in its full strength. The beautiful tone which time gives to all colour-work is difficult to rival, but no conscious imitation of it is tolerable.
But so long as our aim is strictly to make a colour scheme of any kind in relation to itself, or in harmony with its conditions, we are on a safe and sound path. It is this relativity which is the important thing in all decorative art, and which, more distinctly than any other quality, distinguishes it from pictorial art; although pictorial art is under the necessity of the same law in regard to itself; and in its highest forms, as in mural work, is certainly subject to relativity in its widest sense.