A technical dictionary of printmaking, André Béguin.
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linen tester
Linen testers are small optical instruments made of two flaps that unfold to form a mganifying glass. Cloth makers use this instrument to analyse the meshes of their cloth. In printmaking linen testers are used to check op on lines, graining, the granulated plate surface and all other details on a plate. It is also used in serigraphy to check the screens.
[magnifying glass]
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