This color has been reformulated several times due to ongoing research at Golden. A previous version of the color was PW6 PW4 PO73 PY83 PV19, however Golden found that it was less lightfast than they desired (see https://justpaint.org/beauty-and-the-best-wrestling-with-changes-in-williamsburg/). The formulation was changed around 2015 to PW6 PW4 PO36 PY154 PV19. This color was reformulated again in 2018 when Golden did research on zinc. The previous version (pre-2018) contained zinc, and it has since 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 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.