Zaffre

Zaffre is a deep blue pigment historically made from cobalt ores. Traditionally, it was created by roasting cobalt arsenate ores, which then produced a blue colorant used in ceramics and glassmaking. Zaffre has been used since the 17th century and is known for its robust and vivid hue. In modern applications, it can refer to cobalt blue pigments that maintain the same characteristic deep blue color.