zaffre

plural zaffres · alternative zaffer · alternative zaffree · alternative zaffar · alternative zaffir · alternative zaphara

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

   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.

   1791, Erasmus Darwin, The Economy of Vegetation, J. Johnson, page 49

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