Ultramarine
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Ultramarine
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Color Index
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Pigment Blue 29 CI 77007
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Formula
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Na7 Al6 Si6 O24 S3
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Structure
This pigment has a cubic structure.
Properties
As synthetic form of lapis lazuli, Ultramarine is a naturally occurring mineral
that was highly valued by medieval artists. It reflects IR light and absorbs UV,
thus, it should not be used in photopolymerization.
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Properties of ultramarine
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Property
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Ultramarine
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pH
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8-9
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Acids stability
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bad
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Alkali stability
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good
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Solvent resistance
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excellent
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Heat Stability
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excellent
400°C
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Light fastness
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good
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Color
Ultramarine pigment has a brilliant color and a clean shade. The color ranges from
pink, through violet to green.
