Three-colour process: process work using the yellow, magenta and cyan without black.

三色彩印：用黄，洋红及青蓝而不加黑的彩色印刷方法。

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Process inks: Cyan, magenta, yellow and black inks as a set of four for process colour printing.

四色墨：配制为一套，供四色彩印用的油墨，它们分别是青蓝，洋红，黄和黑。

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Blue printer: One of the four printing plates in a subtractive colour process which is to be printed in cyan ink.

蓝版：减色彩印法的四张印版之一。它需用青蓝色墨印刷。

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Looking at the ease with which we now capture colour pictures and transmit them around the world in seconds it's easy to forget that it was not that long ago news agencies were transmitting their wire photographs as colour separations, usually cyan, magenta and yellow - a process that relied on Clerk Maxwell's discovery.

BBC: Pioneering colour photography