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Q&A for How to Expose Photo Emulsion for Silk Screen Printing
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QuestionIf I am exposing using sun light, how many minutes should I expose it for?Community AnswerYou should always expose it for four minutes. But be careful when exposing using sunlight because you might burn it.
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QuestionWhen I wash out my image, why does the emulsion wash away where it should be?Community AnswerThe purpose of the emulsion is to block ink, preventing it from going through the mesh. Photosensitive emulsion hardens when exposed to light, becoming insoluble in water. By blocking light where the image will be, that emulsion remains soluble and can be removed allowing ink through the mesh.
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QuestionWhen using a photographic table for light exposure, what factor will I consider in selecting the right lighting? Is it the wattage of bulb or the lumens it will produce?Community AnswerThis is partly a factor dependent on the specific emulsion used, so YMMV. Some emulsions require UV light to harden, which is why you can find tutorials using halogen bulbs and sunlight to expose the emulsion. For emulsions that harden without requiring UV, you can use a wide variety of light sources like fluorescent tubes and LED arrays. Your lower limit on light intensity (lumens) is a function of how long you want to wait for exposure to harden the emulsion. The upper end is bound by two factors, burning the emulsion, which will mostly be a wattage problem, and bleed through exposing covered areas (lumens).
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QuestionHow long should it be under sunlight?Sabrina RaoCommunity Answer20 hours would be needed, as the sun isn't enough alone. If you are using a fan with your hand, that could just be 5 hours.
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