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PROCESS

A. GALLIREX JOHNSTONI. B.
The Turaco of Ruwenzori.
From a Drawing by Sir Harry Johnston, fromThe Uganda Protectorate,” by Permission of Hutchinson & Co.
 
 Three-Colour Process.
 
C. D. Andre & Sleigh, Ltd., Engravers,
Bushey, Herts.

SHOWING THE SEPARATE COLOURS EMPLOYED IN PHOTO-REPRODUCTION BY THE THREE-COLOUR PROCESS

The three primary colours are separated out by photography, each colour sensation is etched on copper, and when the Blocks representing Yellow (A), Red (B), and Blue (C), as illustrated above, are superimposed in the printing press, the result (D) is a reproduction of the original in all its combinations of colour.