Under Exposure

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Emulsions are composed of polyvinyl acetate covered in polyvinyl alcohol. During exposure, the sensitizer cross-links the polyvinyl alcohol, sealing the polyvinyl acetate inside, rendering it insolvable. If under-exposed, the polyvinyl alcohol will dissolve, allowing the sticky polyvinyl acetate to adhere to the mesh. The sodium-metaperiodate stencil remover has no effect on polyvinyl acetate and thus the stencil will be difficult to remove.