After Exposure, Screen Washout
After screen emulsion applied, and exposed. The screen need to be washout immediately. Because the emulsion chemical reaction still on going. Somehow there are few method screen washing out the block. All depends on light source, UV or normal white light. What I knew, the emulsion chemical is react to UV light. Once it expose to UV with the right timing applied, it wouldn't easy wash out. Even high pressure water jet gun on close distance. No additional Hardener apply after all.
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