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Updated: May 22, 2025
Communicating his idea to Wallerant Vaillant, a painter, they made several experiments, and at last invented a steel roller with projecting points, or teeth, like a file, which effectually produced the black ground; and which, being scraped away or diminished at pleasure, left the gradations of light. Such was the invention of mezzo-tinto, according to Lord Orford, Mr. Evelyn, and Mr. Vertue.
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