DIAGRAM I
The third circle shows how slate, citrine and russet are made. For instance, slate is one part of violet and one part of green. Hence, a tertiary color is made of equal parts of two secondaries.
The outer circle, buff, sage and plum, can be analyzed in the same way.
This [Diagram I] is arranged to show not only component parts of a color, but the parts that properly harmonize.
CONTRASTS
10. In music it is an established fact that certain notes used in pleasing combination produce sounds we call harmonies. The moment that more than one note is struck, there is danger of discord, and when ten notes resound to the touch of the player, they must be the right notes, or they jar upon the sensibilities. In the use of color the same immutable law applies.
11. In Circle [Diagram II] the letters RV mean reddish violet, being a violet having more red than blue in its composition. BV means bluish violet, being a violet having more blue than red in its composition. BG means bluish green, being a green having more blue than yellow in its composition. YG means yellow green, being a green having more yellow than blue in its composition. YO means yellowish orange, being an orange having more yellow than red in its composition. RO means reddish orange, being an orange having more red than yellow in its composition. Thus we may advance from red to yellow by graduations almost imperceptible, by the addition of yellow, to a reddish orange, and so on gradually to orange, continuing on to yellowish orange, finally revealing pure yellow.
