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Plate with nine numbered triangles in red, blue, yellow, green, orange, grey, brown, olive and tan showing colour theory.

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Primary, secondary, and tertiary colours, according to the pigment theory of colouring, Roberts Beaumont (1890). Via artnap.com

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Why is this public domain? Roberts Beaumont died in 1924; this work is in the public domain.

About this work

A plate of nine colour triangles arranged in three rows, alternating upward and downward orientation, each numbered beneath. The swatches show red, blue, yellow, green, orange, grey, brown, olive, and a dark tan, illustrating a colour theory system. This print, titled Primary, secondary, and tertiary colours, according to the pigment theory of colouring, was made by Roberts Beaumont in 1890.