Range of Chroma for Ceilings
The same tendency toward chromatic reduction is to be seen in ceilings, although we have two examples in [Figure 457] (10 and 13) of nearly white and high light ceilings that have not been reduced. To avoid crudity a reduction in chroma by the addition of gray is to be desired.
Rule 12j. Ceilings should usually be reduced in chroma to three-fourths intensity with slightly less than one-fourth chroma as a minimum reduction.
Summary
With a single exception (3A), the stains and wall tints have been selected between and including the red and green rectangles. This is customary and gives safe hue range as it insures the retention of wall and ceiling hues in unified conformity with the warm tints of the natural wood and its equally dark hued stains.
Wall and Ceiling Pigments
The following is a list of dry colors which may be purchased at a paint or hardware store for a few cents a pound. It is suggested for the designer or craftsman who desires to tint his own wall or ceiling. While oil paint is to be preferred, these colors are readily and quickly applied and form serviceable backgrounds.
Calcimine
The pigments are white, yellow ochre, chrome yellow light, chrome yellow medium, and chrome yellow dark, burnt and raw sienna, turkey and raw umber, ultramarine and ivory black. The greens are preferably mixed by adding ultramarine to one of the chromes. Shades are formed by the addition of the siennas, umbers, or black. Black and white, mixed to a gray, are useful in reducing the chroma of a hue. The stains should be mixed with hot water and a small amount of glue for a binder. White occasionally comes prepared with glue in its composition.