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Blue bice

This page presents the spectroscopic analysis of blue bice.
The pigment has been examined using XRF spectroscopy, Raman spectroscopy, FTIR spectroscopy, and reflectance spectroscopy. These complementary techniques provide valuable insights into the pigment’s composition and structure.
This page aims to show which analytical methods are most effective for identifying this pigment in artworks and historical materials. By comparing results across different techniques, it serves as a practical reference for heritage science, conservation, and pigment analysis.

Blue bice is the artificial form of azurite. Numerous early recipes for the preparation of basic copper carbonate are known from the 17th century.

Manufacturer / product code: Kremer / 10184
Chemical description: artificial basic copper carbonate with approximately the same chemical composition as azurite. Kremer PDF
Color: blue
Color Index: PB30
More info: Pigments Through The Ages

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Blue bice - Raman Spectroscopy Pigments Checker

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XRF spectroscopy – blue bice

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Blue bice is a historical pigment prized for its soft, greenish-blue tone. Originally, the name referred to ground natural azurite, a copper carbonate mineral mined in Europe and the Middle East. By the late 17th century, the term also encompassed artificial copper blues—precipitated pigments produced by treating copper with vinegar and chalk. This synthetic form, often called blue verditer, was cheaper and more consistent in color than natural azurite, though usually less brilliant.

Artists valued it for its affordability compared to ultramarine, using it in skies, drapery, and architectural details. However, like other copper-based pigments, it could darken or turn green in oil due to chemical reactions.