This color can be a transparent indigo purple, a solid violet, or even a dull pink. Among paints labeled Ultramarine Violet the color can vary from indigo to violet depending on the brand, and if it labeled Ultramarine Red or Ultramarine Pink it's likely to have a different color appearance entirely. The pink versions tend to be middle chroma (somewhat desaturated) and transparent.

PV15 is often found as a lovely strong purple which behaves somewhat mildly in mixtures, depending on the variety. It is listed as having excellent lightfastness, though there may be some nuance to this depending on the mixing white in oil paints. The indigo varieties are very helpful color for the mixes to neutralize yellow if using oils. A different but equally prized behavior among the pink varieties is their ability to tone down greens. This pigment is related to Ultramarine Red as well as Ultramarine Blue. See also PR259.

While typically in the category of lower concern, Monona Rossol mentions that PV15 may qualify as a "nusiance dust" which does have thresholds for exposure and best practices associated with it. Her work can be found here.