Did you mayhaps mean rubbish?
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“RUBYLITH FOR SCREENPRINTERS, create a hand-cut stencil using masking film; the rubylith will be provided.”
“We still use rubylith at the screenprint co-op I belong to!”
“In the course of my years kicking around the edges of commercial art and illustration, I've stripped negatives and hand-cut rubylith for "black-plus-one-color" printing, and it's really goddamn hard.”
“When I look through that stuff, I can't help but think of rubylith, acetate separations, and little registration marks taped on each layer. yup, I'm an old-timer...”
“From the age of ten, kids need to be hand setting type, cleaning ink, and cutting rubylith separations.”
“The advent of the computer made so much more possible ... no longer did you have to contend with cutting images out of rubylith (!”
Looking for tweets for rubylith.