One of the mysteries of the English language finally explained.
Impure cobalt oxide, formerly used to make smalt and blue enamels.
- ‘In Europe, zaffre was used as early as the 14th century as a pigment for paints, glazes and glass.’
- ‘In Western literature the word zaffer was used to denote this pigment.’
Mid 17th century: from Italian zaffera or French safre.
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