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Cosa (chi) è zaffer$519139$ - definizione
IMPURE OXIDE OF COBALT USED AS A PIGMENT
Zaffer
Zaffre
Zaffre (also spelt Zaffer), a [or alchemical substance], is a deep blue [[pigment obtained by roasting cobalt ore, and is made of either an impure form of cobalt oxideClayArt or impure cobalt arsenate. During the Victorian Era, zaffre was used to prepare smalt and to stain glass blue.
zaffre
['zaf?]
(also zaffer)
¦ noun impure cobalt oxide, formerly used to make smalt and blue enamels.
Origin
C17: from Ital. zaffera or Fr. safre.
Zaffer
·noun A pigment obtained, usually by roasting cobalt glance with sand or quartz, as a dark earthy powder. It consists of crude cobalt oxide, or of an impure cobalt arseniate. It is used in porcelain painting, and in enameling pottery, to produce a blue color, and is often confounded with smalt, from which, however, it is distinct, as it contains no potash. The name is often loosely applied to mixtures of zaffer proper with silica, or oxides of iron, manganese, ·etc.
Wikipedia
Zaffre
Zaffre (also spelt Zaffer), a prescientific, or alchemical substance, is a deep blue pigment obtained by roasting cobalt ore, and is made of either an impure form of cobalt oxide or impure cobalt arsenate. During the Victorian Era, zaffre was used to prepare smalt and to stain glass blue.
The first recorded use of zaffer as a color name in English was sometime in the 1550s (exact year uncertain).
