For polymer exposure—Do I need to invert my line art? i.e. black to white and vice versa.
I figure, since unexposed will wash out, we need white of my the drawing to print black on film, right?
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You need a negative with the emulsion on the top side of the film. Check with local printers to see where to take your art to get negs made. The service bureau will take care of inverting the image.
Film negatives are best. Some folks are having success with laser transparencies, but I don’t recommend it.