Scumming

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Related to scums: scummiest

Scumming

A situation in which a part of a printing plate not intended for ink takes on ink anyway. The ink is transferred to paper by accident. Printers seek to avoid scumming.
References in classic literature ?
There were others, too, ten of them all told, the scum of the South Sea ports; but Gust and Momulla and Kai Shang were the brains and cunning of the company.
After breakfast the men set out to hunt, while the women went to a large pool of warm water covered with a green scum and filled with billions of tadpoles.
A man who goes and takes a special train to London from the docks of a city like Liverpool--a city filled with the scum of the world, mind you--kind of gives himself away as a man worth robbing, doesn't he?