| Zaffre is the roasted mineral ground with sand, while smalt, a term used more frequently, is the fused mixture with sand. |
| In Europe, zaffre was used as early as the 14th century as a pigment for paints, glazes and glass. |
| The first practical use of cobalt was in the form of zaffre or cobalt blue. |
| Dissolve zaffre, in powder, in aqua regia, for twenty-four hours. |
| A little oxide of cobalt or zaffre is frequently added to alter the shade. |
