[zaf-er] 
| an artificial mixture, resembling smalt, containing cobalt oxide and, usually, silica, used to produce a blue color in glass and in ceramic glazes. |
| zaf·fer also zaf·fre (zāf'ər) n. An impure oxide of cobalt, used to produce a blue color in enamel and in the making of smalt. [Italian zaffera, from Old French safre, perhaps alteration of safir, sapphire; see sapphire, or from Arabic ṣufr, yellow copper, brass, from 'aṣfar, yellow; see ṣpr2 in Semitic roots.] |
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