Quinacridone Orange
Cinquasia Red Gold
Quinacridone Rust
Quinacridone Gold
Unfortunately this fabulous pigment has been discontinued. However, as of recently it was offered by four major paint brands, and may still be found in a few sap green blends.

M Graham Quinacridone Rust, PO48
It is like a much more vibrant earth tone, a sort of bright orange brown which thins beautifully. It's like a chromatic, rich, dark stained glass-like color, like a super-charged chromatic Burnt Sienna. It has excellent lightfastness in oil.

M Graham Quinacridone Gold PO48
Along with Quinacridone Gold, PO49, it was smashing for botanicals and all kinds of realistic subjects. Read the in-depth article here.
PO48 pigment data from David G. Myers, The Color of Art Pigment Database, Artiscreation.com
Information about PO48 from Bruce MacEvoy, Handprint Guide to Watercolors, General information about this class of pigments from Handprint,

Excellent
Consistently receives highest marks, but may be less lightfast in watercolor. However Bruce MacEvoy’s tests found it to be Excellent.
Transparent
Lower Concern but like all pigments, take care to avoid it in dust form. There is a special note to avoid the dust with PO48.
Treat all pigments and paints with studio safety protocols.
Medium to Slow
Fine
Quinacridone
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