Is it possible to define a totally new colour for a label?
I realise there is a pretty wide palette of possibilities already, but trial-and-error testing (creating lots of new labels) gave me the impression that colours for new labels are still drawn from a restricted set (maybe 30-40?).
I wanted a green dark enough for white text to appear (with high-contrast) and the only dark green that currently does that is too vivid for me.
I was after something like this green: Cal Poly Pomona green: en.wikipedia.org/wiki/Variations_of_green
Hex triplet #1E4D2B
RGBB (r, g, b) (30, 77, 43)
HSV (h, s, v) (137°, 61.0%, 30.1%)