This color is part of Williamsburg’s Traditional Color series: “An ideal starting place for artists who are interested in exploring a more traditional range of colors.” In 2023, Golden published a vital series of tests on their colors and how they performed in mixes with various white paints. There were some surprises with Cerulean’s performance especially under certain exposure conditions. More information can be found at https://justpaint.org/astm-lightfastness-testing-for-oil-paints/.