Recently I was reading an old Darkroom Techiques article on the use of filters w ith black and white film. The magazine published a colour wheel and explained t hat the filter would not "see" the colour opposite it on the colour wheel.
So far so good.
Then I noticed that opposite red is magenta; while opposite yellow is blue. So why does a red filter substantially lighten (on the neg) blue, even more so than a yellow filter? I've always used yellow/orange/red in that order, to darken t he sky (on a print).
Hmm?
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