Key Technical Specifications:
Color Index: PV15 (77007)
Chemical composition: Modified sodium-aluminum sulfosilicate (Na₆₋₈Al₆Si₆O₂₄S₂₋₄)
Lightfastness: Excellent (grade 8 out of 8 on the Blue Wool Standard scale*). Completely UV-resistant; does not fade or change when exposed to direct sunlight.
Alkali resistance: Very good. Fully compatible with acrylic emulsions, lime, and cement mixtures.
Acid Sensitivity: An Important Detail! Similar to ultramarine blue, PV15 breaks down and loses its color upon contact with acids. It is not recommended for use in exterior coatings in heavily polluted or industrial areas where there is a risk of acid rain.
Dispersibility: Hydrophilic pigment. It absorbs and mixes easily with water and water-soluble media without requiring aggressive mechanical agitation or large amounts of surfactants.
Due to its unique translucency and low tinting strength, this pigment is used for fine details and subtle shades:
Painting (Oil, Acrylic, Tempera, Watercolor): Indispensable in classical and portrait painting for rendering soft shadows, atmospheric perspective, fog, clouds, and delicate skin tones. Due to its natural transparency, it is popular for velaturas and glazes—applying it in thin layers adds optical depth and a cool nuance without the risk of the color becoming “overpowering.”
Neutralizing Yellow: In artistic practices and restoration, it is often used to optically neutralize unwanted yellow hues without darkening the overall tone of the painting.
Epoxy resins and plastics: Allows for the creation of beautiful, glass-like, delicate purple effects in transparent castings. Due to its fine structure, it settles very slowly in liquid resins.
Decorative Plasters and Frescoes: Suitable for interior decorative finishes, interior design, coloring plaster, and interior lime paints.
Specifics of the job:
Ultramarine violet has lower intensity and tinting strength compared to highly opaque organic violet pigments (such as dioxazine violet). This makes it exceptionally easy to control the color palette, as there is no risk of it “overpowering” and contaminating the other colors when mixed.
*Note regarding lightfastness: The Blue Wool Scale is the international laboratory standard for measuring the lightfastness of dyes. It consists of 8 grades, with Grade 1 indicating minimal resistance and Grade 8 indicating maximum resistance to UV rays and complete protection against fading over time.







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