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  • Sinopia or Sinople, (from Greek Σινωπίς "of Sinope") is a dark reddish earth pigment, whose color comes from hematite, or dehydrated iron oxide. It was produced during classical antiquity at a Greek colony on The Black Sea, where the modern Turkish city of Sinop is located. During the Renaissance it was often used to make the underpainting of a fresco.

It can also refer to:

  • Sinopie (the plural of the Italian word for the pigment) are the under paintings, made with dark red sinopia pigment or other dark colors, which guided Renaissance artists as they painted a fresco.
  • sinople, also sinoper, a term for "red", and later "green" in heraldry, see Sinople (heraldry)
  • In cryptography, sinople is a 128-bit symmetric block cipher