By itself, that is not so interesting, but a sandwich, in which each layer contains particles of a different primary colour, could be used to generate blocks of any conceivable colour, and it is this that Dr Lenssen is working on. Indeed, by giving different electrical charges to the particles of his three primaries—yellow, magenta and cyan—and to those of a fourth “colour”, black, which provides shading, he has designed a system in which only two layers are necessary, one with capsules that contain magenta and black, the other containing yellow and cyan.

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