Ultramarine is famous for its characteristic bright blue hue. The pigment is non-toxic, lightfast and suitable for most artistic techniques, but has limited alkali resistance and grays in acidic media. This pigment is the standard grade for oil, glue and lime. It is also suitable for use in acrylic, tempera and watercolor.

• Chemical description: Sodium-aluminium-sulfo-silicate. Pigment Blue 29, C.I. 77007
• Lightfastness - thinned: 8 (1 is bad, 8 is best)
• Lightfastness - medium: 8 (1 is bad, 8 is best)
• Lightfastness - concentrated: 8 (1 is bad, 8 is best)
• ColorIndex: PB 29.77007
• Suitability: Acrylics, Lime / Fresco, Oil, Tempera, Watercolor / Gouache
• Colors: Blue
• Forms: powder
• Solubility in water: insoluble

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