This color is not part of a commercial set, however it is mentioned as part of Williamsburg’s six Chromatic Darks. From their publication, Just Paint they explain, “These colors are all blends, containing a natural iron oxide or Ivory Black and one or more strongly colored pigments to give them their chromatic punch. When painted from the tube, they visually resemble a colorful black, but when scumbled, tinted or mixed, these darks start to show their true color!” In regard to this color specifically they say, “Payne’s Gray (Violet) is a play on traditional Payne’s Gray. Instead of Ivory Black and Ultramarine, it contains Raw Umber, Dioxazine Purple (Williamsburg’s Egyptian Violet) and Ultramarine Blue. This is a dark, smoky purple, great for neutralizing lighter mixtures or for providing the base for shadows in portraits or landscapes. Payne’s Gray (Violet) tints to make a misty dull mauve, reminiscent of pleasant looking smoke or shadowy clouds. It mixes like a weak blue. It is Semi-Opaque, very fine and fast drying.” As a mixture, this color does not appear to have been specifically mentioned, however it is worth noting that Golden published groundbreaking lightfastness testing in various white colors. The choice of mixing white may affect the performance of certain pigments. See https://justpaint.org/astm-lightfastness-testing-for-oil-paints/ for more information.