ferretton.
/fɛˈrɛtəʊ/ Copper calcined with brimstone or white vitriol, used to colour glass.
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the world > matter > colour > named colours > brown or brownness > colouring matter > [noun] > stains
ferretto1662
walnut1709
Venetian brownc1791
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the world > matter > chemistry > elements and compounds > metals > specific elements > copper > [noun] > compounds
ferretto1662
burnt copper1790
1662 C. Merrett tr. A. Neri Art of Glass 29 To make Ferretto is nothing but a simple Calcination of Copper.
1738 G. Smith tr. Laboratory ii. 45 Feretto of Spain is thus prepared.
1753 Chambers's Cycl. Suppl. Feretto, a substance which serves to colour glass.
This entry has not yet been fully updated (first published 1895; most recently modified version published online December 2020).
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n.1662