A paper defect characterized by a hairline indentation in the surface of a paper's coating 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 applied coating as the web travels past it. If the particle is large enough, it can cut right through the web, producing a blade cut, or carve a wider furrow than a scratch, called a blade streak.
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