Manganese Violet
Manganese Violets differ in their color from brand to brand. This is a very high chroma version at chroma 9 according to Williamsburg. While definitely violet, it’s hue is a little more toward blue end of purple than some brands.
In 2023, Golden published a vital series of tests on their colors and how they performed in mixes with various white paints. More information can be found at https://justpaint.org/astm-lightfastness-testing-for-oil-paints/.