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back when I was about 10, in 1963, I asked my mom about this color conversion device. She told me it was a POS, always blue on top, always green at the bottom, and always brown in the middle, and it would not make sense on every scene on TV. I could see then that it was a stupid product...
Heard about some early video arcade games where they used colored plastic sheet as filters on a B&W CRT tube face to make it look like color. Of course your only choice was just varying amounts of some fixed color at some specific pixel on the tube.
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