This color contains the following pigments:
complex silicate of sodium and aluminum with sulfur
Ultramarine Violet is a semi-transparent, dull purple to pale violet with low tinting strength. As a pigment, it is weak in most oil applications, but it performs better in water-based mediums, pastels, and chalks. It is generally the bluest of the violet pigments, although there can be significant differences in color across brands. It is not suitable for fresco work and does not mix well with yellows. Ultramarine Violet is a variant of Ultramarine Blue, and their pigment properties are identical.
Ultramarine Violet has excellent permanence and lightfastness.
Ultramarine Violet has no significant hazards.
Dioxazine Violet is transparent and has very high tinting strength. It is a staining pigment, very dark valued when it is used at full strength. Concentrated, it paints out nearly black, but it mixes with Titanium White to form bright, opaque tints of purple. Pigment PV23 produces slightly redder shades than PV37. Because the hue can vary with the conditions of preparation and grinding, it may be offered in red shade, blue shade, and so forth. PV23RS is a preparation of PV23 that tends to reddish hue.
Dioxazine Violet has good lightfastness. There may be some concern about it fading or shifting in color in tints and washes. Some artists have reported that PV37, a molecular variant, is more lightfast than PV23.
Two molecular variants of Dioxazine Violet, PV23 and PV37, are available. They have similar properties, but mix slightly differently.