About this term

Source: Oxford University Press

Type of painting medium used to bind pigments. Strictly, and as used by Cennino Cennini in his Libro dell’arte, the term may be applied to any combination of pigment and medium. By the 16th century, however, Vasari used the term specifically to mean egg tempera, a paint made using egg yolk as the binding medium, and this is the meaning now generally understood.

Jill Dunkerton

From Grove Art Online

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