This color is part of their Signature Color series: “Throughout Williamsburg's history, exploration and experimentation have led to the development of several unique colors. The Signature Colors set contains 8 colors representative of these discoveries.” As a mixture, this color was only mentioned in regards to diluted tints, 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.