A paper defect characterized by a hairline cut through the thickness of a coated paper, running in the grain direction, caused by a particle becoming attached to the back of the blade on a blade coater, which then carves a narrow furrow in the paper as the web travels past it. A smaller particle will only carve a narrow, hairline scratch in the surface of the coating, producing a blade scratch, and a larger particle will cut a wider furrow than a scratch, called a blade streak.
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