This color has been reformulated several times due to Golden’s research. A 2015 lightfastness reformulation is discussed here https://justpaint.org/beauty-and-the-best-wrestling-with-changes-in-williamsburg/. The pre-2015 formulation was PW6 PW4 PO73 PV19 and it changed to PW6 PW4 PR112 PY154 PV19. They reformulated it again in 2018 to remove the zinc. The pre-2018 version contained zinc which has been removed. More information on the zinc discontinuation can be found here:https://justpaint.org/zinc-oxide-warnings-cautions-and-best-practices/. In 2023, Golden published a study on lightfastness interactions with white. 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. Please bear in mind that while this color has improved dramatically through the reformulations, it only has an estimate of ASTM II LF, and so while we wish it were even more lightfast, we’re glad for the improvement. It’s hard to get a LF match in the high chroma notes of this color space.