Ultramarine ash

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Ultramarine ash

Description

The end-product of the refining process used to produce natural ultramarine blue pigment from lapis lazuli. Ultramarine ash contains small blue particles mixed with a large proportion of colorless materials, such as calcite and silicates. Ultramarine ash is a transparent blue-gray pigment that has been used for glazing.

Synonyms and Related Terms

mineral blue; Sander's blue; Saunder's blue; bleu cendres; vein stone

XRD

PIG464.jpg

SEM

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EDS

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XRF

Slide7 F464.PNG


Other Properties

Discolors when exposed to weak acids or sulfur fumes.

Hazards and Safety

No significant hazards.

Additional Information

J. Plesters, "Ultramarine Blue, Natural and Artificial", Artists Pigments, Volume 2, A. Roy (ed.), Oxford University Press: Oxford, 1993.

Additional Images


Sources Checked for Data in Record

  • Ralph Mayer, A Dictionary of Art Terms and Techniques, Harper and Row Publishers, New York, 1969 (also 1945 printing)

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