Plate 65
Rule 12g. Ceilings should be colored by a lighter tint of the side walls or by a lighter tint of an analogous hue.
Range of Chroma for Stains
Stains, as they occupy a comparatively limited area in the room color scheme, are of their full chroma value or reduced to three-fourths chroma. In only one instance (18), [Figure 463], do we find a reduction to one-fourth chroma, demanded by the nearly gray color scheme of the walls. We find it to be an established fact that small areas are capable of enrichment by colors of greater purity and higher chroma than larger surfaces. A silver pin may be designed to contain a stone of high brilliancy, but a wall surface has to be materially reduced in chroma to possess color harmony.
Rule 12h. Stains are usually not reduced to below three-fourths chromatic intensity. Nearly gray side walls, however, call for a reduction to one-fourth intensity.
Range of Chroma for Walls
As the walls occupy a large proportionate area of the color scheme of the room we find it necessary to reduce them in chroma in order to soften the glare of too brilliant colors. [Figure 457] shows only one instance (14) of a hue unreduced in chroma. It is retained at the full chroma for that value on account of the brightness of the sage green wood stain. The other hues represented in the diagram are grayed or reduced in chroma from three-fourths to less than one-fourth, or to nearly neutral gray.
Rule 12i. Wall colors are usually reduced to three-fourths chroma to a minimum reduction of slightly less than one-fourth chroma.