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Ink Print Technique?


amul

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Bromoil is an ink print process, more or less, and there's a gumoil as well; both can be used with oil based printer's inks or artist's colors. Gumoil is simpler and cheaper: hand coated with sensitized gum arabic or other vegetable gum, which hardens when exposed to light, so as to wash away preferentially in the unexposed regions, which then accept color while the gum resists -- if I've understood this correctly, it's a direct positive process; that is, you would need to contact print from a positive transparency.

 

Lots of information available if you search for "bromoil" or "gumoil" or "gum bichromate" -- the difference between a gum bichromate and gumoil is that the gum is pigmented in the bichromate process, and produces a negative (the exposed gum stays, so the pigment stays in exposed areas), while gumoil uses the exposed gum as as resist and produces a positive. Gum bichromate, aka gum printing or color gum, is also used to produce tricolor prints starting from separation negatives by printing multiple layers with different pigments; this doesn't work as well with gumoil because previous layers will continue to resist the ink.

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