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Not claiming it's used (see NOTE1), but the result resembles how BW photos in the past came out from photographic printing. Here's described one old process for hobbyists http://www.alternativephotography.com/an-introduction-to-the-gum-bichromate-process/ One makes his own photosensitive paper which will take ink differently depending on how strongly it's ...


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The technique is called solarization. It can be achieved in a b/w photo dark room, when the printing paper is exposed and already in the developing fluid for a bit, the room lighting is quickly turned on and off, so light areas get exposure too. Durations of exposure and development can be varied to achieve a variation of different results. Photoshop does ...


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