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If you balance out the colour with a CMYK it should actually be feasible to have up to a 75% black, that's what I should have aimed for.
The limit with screen printing is with the detail. This was done at 65 lines per inch which is a noticble halftone. I like the style of them though.
It's interesting that the slightest change of pressure or squeegee angle changes the amount of ink going down and so the contrast and saturation. Every print has to be done in exactly the same way or risk them all looking different.... that's the art I guess.
it's amazing how much "colour" you see just from the cyan and magenta.
there's an early colour photo process where you made 3 negatives and then exposed each onto a single print, I think. there's some examples in the V&A photo gallery.
ETA: oh looks like dye transfer https://www.vam.ac.uk/articles/photographic-p . I thought it was something earlier than that...