Mine as well. The W&N Griffin Indian Yellow is a single pigment PY139 formulation, so apart from glazes, it behaves well when mixed with other colours.Yeah, that W&N Griffin Indian Yellow is one of my favorite colors.
For the sake of clarity, the paint Hermes2020 and I mention is from Winsor and Newton's line of Griffin alkyd oil paints. I don't know what pigment they use in their Artist Oils.Winsor & Newton Artist Oil ... forgot .. had one from a different company and it was garbage.
For some reason known only to them, the W&N oil is not formulated with PY139. I seem to recall it is a mixture of two pigments. I will have to check when I have a moment.For the sake of clarity, the paint Hermes2020 and I mention is from Winsor and Newton's line of Griffin alkyd oil paints. I don't know what pigment they use in their Artist Oils.