When a full colour is contrasted with another of a lower tone, the volume of the latter must be proportionally increased. When a primary tinged with another primary is contrasted with a secondary, the secondary must have a hue of the third primary. The various colours should be so blended that the objects coloured, when viewed at a distance, should represent a neutralised bloom. No composition can ever be perfect in which any one of the three primary colours is wanting, either in its natural state or in combination. When two tones of the same colour are juxtaposed, the light colour will appear lighter, and the dark colour darker.
Black grounds suffer when opposed to colours which give a luminous complimentary.
Colours should never be allowed to impinge upon each other. When ornaments in a colour are on a gold ground, the ornaments should be separated from the ground by an edging of a darker colour. Gold ornaments on any coloured ground should be outlined with black. Ornaments of any colour may be separated from grounds of any other colour by edgings of white, gold, or black. Ornaments in any colour, or in gold, may be used on white or black grounds, without outline or edging.