This is a lemon yellow that is fairly rare in oils. Known as Diarylide Yellow H10G. It has an ASTM LF rating of II. For some reason it is not found as a single-pigment yellow in oils but for some reason it seems to be more frequently blended with titanium white into a convenience blend to make colors like Lemon Yellow, Permanent Yellow Pale and Titanium Yellow. There is at least one single-pigment paint in watercolors.
