Purpureus is an old purple name, recorded centuries before digital color systems. The present swatch feels less royal than practical. It can mark a category without carrying the darkness of plum.
White can handle large lettering on Purpureus, but fine labels benefit from a softer off-white. Black creates a harsher break and suppresses some of the purple's warm side.
Amethyst Purple adds a softer neighboring note around Purpureus. Fern Green works as the larger supporting field when the composition needs a natural, lower-energy contrast.

Tints
#9a4eae
#a460b6
#ae71be
#b883c6
#c295ce
#cca6d6
#d7b8df
#e1cae7
#ebdcef
#f5edf7
#ffffff
Shades
#9a4eae
#8b469d
#7b3e8b
#6c377a
#5c2f68
#4d2757
#3e1f46
#2e1734
#1f1023
#0f0811
Triadic
#9a4eae
#917d31
#31917d
Monochromatic
#643371
#7e408f
#9a4eae
#ac6ebd
#bd8cca
Analogous
#4d3191
#9a4eae
#913175
Complementary
#9a4eae
#459131