Rule 12l. One hue, or a group of analogous hues should dominate all color schemes. The point of concentration may be emphasized by one hue related to the other hues by (1) contrasted, (2) dominant, (3) analogous, (4) complementary relations. This hue should make slightly stronger value and chroma contrast than the remaining hues.
Rule 12m. An extreme range of five values is generally sufficient to supply contrast to a design but still retain its value unity. Restraint in the use of values is essential.
Rule 12n. The amount of chroma may be increased in proportion to the decrease in the decorated area. Exceptions may be made to this under Rule 12o.
Value and Hue and Chroma Range for Small Areas
In the vase, [Figure 464A], the designer selected hues from neighboring or analogous rectangles green and blue-green. The value range is restricted to four steps and the areas of concentration are placed at the top of the vase by the stronger value and hue contrasts of the foliage of the trees and dark blue rim. In both Figures, 464A and 465, the designer has used analogous hue arrangements. This is suggested to the beginner as serviceable for objects exceeding the dimensions of jewelry and includes such problems as vase forms, book stalls, and brackets. Contrasted and dominant arrangements are also good, safe, and sound arrangements, but fail to give the variety of color to small objects afforded by analogous grouping. At a later point in this chapter the subject of complementary coloring will suggest a new arrangement to the reader, but this scheme is to be left until he has sufficiently mastered the possibilities of the arrangements just indicated.
Five values form a safe value range for small objects. It is good practice to keep the larger areas, including the background, within three steps of each other and to allow the point of concentration to form the strongest value contrast.
Over Reduction in Chroma
The chroma may range from full to three-quarters intensity. Reduction to one-half or one-fourth intensity is inclined to make a small object appear washed out or chalky. Shades, at their full intensity, are good colors to use for small surfaces in wood. Small enameled objects may be developed in full chroma, while pottery forms range from full chroma to one-half chroma in forms of slip and underglaze painting.
Color Applied to the Surface Enrichment of Metal
It is interesting to note the gradually increasing chroma percentage of the different coloring media in direct proportion to the reduction of the area of the surface to be enriched. By comparing the diagrams of [Figures 464] and [457] it will be seen that there is a steady movement toward the left sides of the hue rectangles or toward stronger intensity. The wall areas are shown to be lowest in chroma, followed by the increasing intensity of wood stains, glazes, and enamels.