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.
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References in classic literature ?
Peter had already lashed himself to the wheel; but he piped all hands and delivered a short address to them; said he hoped they would do their duty like gallant hearties, but that he knew they were the scum of Rio and the Gold Coast, and if they snapped at him he would tear them.
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.