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Thinking about the effects of subtractive colours with paints never maps successfully onto additive colours we have on screen. In fact the way in which say blue and yellow make a form of green by subtraction is fascinating and explains why you can never mix a really bright colour. There is no equivalent on screen as far as I know.

I was taught to put my black paint away and never ever use it! You really don't need it (unless you want to paint something that is actually black).

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