zaffre

Definition

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

Etymology

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

Example Sentences

• "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."