More on Secondary Colours from Infoplease:

• Secondary Colours - Secondary Colours (See under Colours.) Source: Dictionary of Phrase and Fable, E. Cobham Brewer, ...
• Colour - Colour (See Rank.) Colour Colours. A man of colour. A negro, or, more strictly speaking, one with ...
• Dictionary of Phrase and Fable: S - Definitions, origins, and illustrative excerpts for words, phases, and literary allusions starting with "S"