This color was reviewed for lightfastness in 2015, as one of the ingredient colors had not been rated officially by the ASTM. Golden assigned an estimated equivalent of ASTM I. In 2023, Golden published new lightfastness research. 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.