zaffre

noun /ˈzæfə(ɹ)/

1. Cobalt oxide obtained by roasting cobalt ore, used as a blue pigment.

   countable, uncountable

   If Zaffre or Regulus of Cobalt be dissolved in the same manner in spirit of nitre, or aqua fortis, a reddish colour is produced on exposing the paper to heat.

2. A cobalt blue colour, like that of the pigment.

   countable, uncountable

Where it comes from

From Italian zaffera, from Latin sapphirus (“sapphire”). Doublet of sapphire.

Adapted from the Wiktionary entry zaffre (CC BY-SA 4.0).

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