This a hidden treasure trove of colours, the masstone (straight from the tube) is an unassuming yellowish brown. However when it is brushed out a vast variety of beautiful, transparent yellows appear depending on the thickness to which it is brushed. You can just see this effect in the masstone image on the left.
The tints (adding white) offer another array of delicate yellows, very floral in appearance.
Mix with phthalo green for some of the zingyest greens on the planet (not sure zingyest is a word but describes what I am trying to say very well!).
The pigment is from a group of pigments called metal azomethines which are not currently used much in oil paint manufacture, however with the range of options a single tube of paint like this can offer, surely there will be more available soon.
Pigment - PY150, Nickel Azo Complex
Vehicle - Linseed Oil, Consistency - Buttery