The image, a detailed drawing of a tree, was ideal for a photo stencil, so yesterday I prepared the screen with photo emulsion and left it in the dark to dry. Today I set up the light -- a 150-watt flood lamp attached to a piece of 3 x 1" board -- and gave the screen an exposure of 24 minutes.
Sad to say, the unexposed parts of the screen (the drawing) failed to "open" properly afterwards and in the end I had to abandon it and wash out the whole screen, which was pretty difficult to do. It took over an hour of scrubbing and washing with chemicals.
I think the exposure time was too long. I will try again with a shorter exposure and possibly raise the lamp a couple of inches.
I can't complain, having skipped the step in the reference book* which recommends doing a series of timed test exposures.
*Screen Printing, Contemporary Methods and Materials by Frances and Norman Lassiter, 1978, Hunt Manufacturing, Philadelphia
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