MMMM, Danial Smith Quinacridone Magenta, Transparent.
Danial Smith's Magenta is unique among all oil brands, they are the only company using the Quinacridone color PR122. (2004) Check your brand of magenta.
It makes the best dark neutral when mixed with it's opposite color Thalo Green.
This mixed dark is the midday shadow of the foreground darks,
making this one of the most important pigments on the palette.
Find this color on a real color wheel.