Zaffre (also spelled Zaffer), a prescientific or alchemical substance, is a dark blue pigment obtained by roasting cobalt ore, which consists of an impure form of cobalt oxide or impure cobalt arsenate. In Victorian times, saffron was used to make glazes and tint glass blue. The first recorded use of saffron as a color name in English dates from 1550 (exact year uncertain).
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