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buon fresco

buon fresco
  (bwon ˈfresko)
  [It., lit. ‘good fresco’.]
  = fresco n. 2 a.

1874 Amer. Cycl. VII. 483/1 Painting designs in colors ground in water and mixed with lime upon the freshly laid plaster..was called by the Italians buon fresco, or the true fresco. 1957 Encycl. Brit. IX. 835/2 In the 15th century, Italian painters distinguished between fresco secco—the pigments being mixed with egg as a medium, and buon fresco—the pigments being mixed with water and laid on the fresh wet plaster.

Oxford English Dictionary

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