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Some comics are black and white for budget reasons (or maybe the artists changed their mind later). Or maybe most pages are black and white, and only a few are colored. Later (quite possibly because these comics sold well) they are remade, with every page being colored.
I suppose this should be mentioned in relevant work pages; not sure how to phrase this or if this is a known trope.
(I am also interested in that part about some comics being mostly black and white, with a few colored pages).