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Helps to find the best exposure time.
Use: according to the emulsion manufacturer’s recommendations. For example, you let screen exposure for 10 minutes, then when washing the stencil, you have to see which section was washed best. If the first section is the best, it means that 10 min is best suited for exposing the screen, if the middle section is the best, then 5 min (10 x 0.5) is the best time, and so on.
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