Extinct In The Wild - Quin Gold (pt.1)
Quinacridone Gold PO49 - Extinct in the wild.
It went out of production as a pigment in the late 1990/Early 2000s, and the last company to offer it was Daniel Smith in 2005, with the last vestiges running out sometime in 2018.
Gurrera Pigments has a small amount left as liquid dispersion, this being "new old" dupont stock from the 1950s A few hand-made, small batch, artisans still produce it from this and once in a great while someone will look at the 30 large tubes of Daniel Smith that they hoarded, realize they're all rock solid, and pop them on Ebay to be someone else's problem Precious - at a premium.
Pictured is an example by Prodigal Son's who produces handmade, small batch, watercolors from rare and historic pigments. Another brand with this pigment on offer is Nightshade, and very, very, very rarely some other pigment nerds will produce a couple of pans of their own.
I am an absolute slut for a good green, and green is awful when it comes to "single pigment" options (see previous rant). The only green pigments you would really call "green" are probably PG8 (Nitroso Green, variably lightfast), PG17 (Chrome Oxide green, fully opaque), and maybe some iterations of PG36 (Phthalo Green Yellow Shade, of which most are decidedly BLUE).
But you know what makes a fantastic green? This color, with a littel of the Phthalo green/s. God... the subtle shades of pure summer leaf splendor into deep fall oranges is really worth it if you do a lot of botanical illustrations.
Hopefully, some day, a new manufacturer of Quinacridone pigments will show up, and bring these back into regular ciculation. (Swatch stamp from Kim Crick)