Very interesting how different pigments hue-shift in opposite directions, some significantly.
Theres a YouTube vid showing the different hue-shifts and tinting strengths of Michael
Harding lead white, zinc and titanium white by Vicki Norman. Its rather striking how the same yellow, red and blue paint samples shift in hue and chroma when tinted with different "white" pigments ...not just in value.
I think that many artists underappreciate the effect that white paints have even though it's often half or even three-quarters of the paint on their canvas. As a watercolorist, i used to not think much in terms of "white" since our white is the paper. But recently working in oils, titanium white suddenly becomes a new variable I never fully-appreciated. Not just it's tinting properties, but the effect it's high opacity has on the palette-blends.