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The impression of white light can be created by mixing appropriate intensities of the primary colors of light — red, green and blue — a process called additive mixing, but the illumination provided by this technique has significant differences from that produced by incandescence.
Crystal boundaries and imperfections can also make otherwise transparent materials white, as in the milky quartz or the microcrystalline structure of a seashell.
This is also true for artificial paints and pigments, where white results when finely divided transparent material of a high refractive index is suspended in a contrasting binder.