Kremer Pigmente GmbH & Co. KG     Kremer Pigments Inc., USA  

Blue verditer or blue bice is a name now given to an artificial basic copper carbonate, 2CuCO₃.Cu(OH)₂, which is similar in composition to the mineral, azurite.

Blue verditer is a manufactured copper carbonate and was widely used as a wall paint in the 17^th and 18^th century, with a continuing use up to the 19^th century.

This synthetic azurite with a deep blue, slightly more greenish hue than the natural variety and lends itself to more even applications. Microscopically, blue verditer may be seen as tiny, rounded, fibrous aggregates, even in size and blue by transmitted light. It is similar in colour to finely ground azurite.

Historically, it was mixed with smalt for deeper shades. According to Laurie, the manufacture of blue verditer seems to have been carried on in England in large quantities at one time. Blue verditers were the best cheap substitutes for the more expensive azurite and ultramarine.

Blue verditer is suited for tempera and watercolour, not for oil. The pigment is described in Artists' Pigments Vol. 2, by R. Gettens and E. West Fitzhugh.