Spent time this weekend setting up a palette for next week's Alvaro Castagnet workshop and made a color chart as several of the colors he requested--lots of warm reds, e.g. Mayan orange, pyrrol red--aren't on my palette.
(18 of the colors are his recommendations; I added 2: azo green and dioxizine violet.)
I got into the habit of avoiding warm reds, using burnt sienna instead, because all the ones I tried seemed pretty opaque and didn't make nice purples.
But these make some lovely mixes!