Yellow6 (two equivalents).
Blue8 (one equivalent).
Red5 (one equivalent).
In the purple—
Blue8 (one equivalent).
Red5 (one equivalent).
Of the pure colours—
Yellow3 (one equivalent).
Red5 (one equivalent).
Blue8 (one equivalent).
Thus we have three equivalents of each primary, which give a perfect harmony.
I must not say more respecting the laws of harmony, for in the space of a small work it is impossible to do so, but proceed to notice certain effects or properties of colours, which I have as yet only alluded to, or have passed altogether unnoticed.
I have said that black, white, and gold are neutral as regards colour. This is the case, although many would suppose that gold was a yellow. Gold will act as a yellow, but it is generally employed as a neutral in decorative work, and it is more of a neutral than a yellow, for both red and blue exist largely in it. The pictorial artist frames his picture with gold because it, being a neutral, does not interfere with the tints of his work. It has the further advantage of being rich and costly in appearance, and thus of giving an impression of worth where it exists.
Black, white, and gold, being neutral, may be advantageously employed to separate colours where separation is necessary or desirable.
Yellow and purple harmonise, but yellow is a light colour and purple is dark. These colours not only harmonise, but also contrast as to depth, the one being light and the other dark. The limit of each colour, wherever these are used in juxtaposition, is therefore obvious.