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. Testing was done on phthalo blue and phthalo green and there were some interesting results. See https://justpaint.org/astm-lightfastness-testing-for-oil-paints/ for more information.