The real thing, ground with stone rollers. The pigment Lead Antimoniate, used since the 5th Century B.C.
Basically in my experience a unique pigment, providing tint power in a muted yellow hue. It's cool, dense quality make it stand alone in the world of yellows.
In masstone a gently acidic primrose yellow, leaning to the greener end of the colour wheel.
In tints where it holds it's own, it makes the most, utterly, delightful gentle cool yellows really only usually witnessed in nature.
There is no need to write any more. Stunning and encompasses everything special about oil paint.
Technical Overview
Pigment - PY41
Vehicle - Linseed oil
Opacity - Opaque
Tint Power - Medium
Drying time - Fast