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opaque

difficult to see through or understand â– verb to remove spots, blemishes or other parts of a negative which are to be cut out from a plate, by painting over them with an opaque ink â– noun ink used to cover up parts of a film

COMMENT: Mechanical pulp will produce opaque paper; if woodpulp is chemically treated or beaten to increase its strength, it will lose opacity, and if beaten long enough will become semi-transparent (like tracing paper). Printing opacity of paper is usually measured with an opacimeter. The measurement essentially involves finding the ratio of light reflected by one sheet of paper to that reflected by a thick pile of the same paper.

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Other Terms : finished document | cross-section | discounter

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