Pure neutral tints lie on the diagonal ON of the cube, equally inclined to the three principal axes.
Red violets will be found on the plane ROB, between OV and OR.
Blue violets on the same plane between OV and OB.
“Saddened” red violets all within the wedge or open space enclosed by the three planes, whose boundaries are OB, OV, ON.
The other colours, red and yellow oranges, blue and yellow greens, pure and saddened, are found in corresponding positions in relation to the other cases.[4]
CHAPTER XI.
The Spectrum in relation to Colour Standardization.
The spectrum has naturally been considered as a suitable source for colour standards, but the power of analysing has disclosed some difficulties, which have yet to be overcome.
Concerning the prismatic spectrum, there has always been a difficulty in apportioning the different colours to specific areas, and further, before this spectrum is available for colour standardization, some method of correction for the unequal distribution of colours must be devised.