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When I was in high school in the late 50s there was an article in Scientific American by Edwin Land, of Polaroid fame, about two color photograpy. I used my 35mm camera to photograph still objects on black and white film through first a cyan and then a magenta filter. I then used two slide projectors with filters to project the slides on a screen. The results were amazing, considering that there were only two colors used, but didn't come close to the quality of 35 mm color slides. Some colors (I can't remember which ones) were reproduced very poorly. I think Polaroid may have actually made 2 color film?
At the 1993 Early Television Convention we had a presentation about a two-vidicon color camera that the presenter (Gary Davis) had built, in the early 60s, I think. The design came from an article in Radio Electronics.
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