Thanks, Chuck - all these discussions of pigments, info you've shared
with us, but I never picked up that purple has yellow pigment. Makes
sense of some of the seedling colors for me.
<Combinations of yellow (alpha-carotene in most cases) with
anthocyanin blue can give a range of colours. Browns, reds and purples
are most likely.
The hot water test will take out water soluble anthocyanin leaving
oil soluble cartenoids pigments.
Purple is always a combination, as is brown and red. Without yellow
you get various shades of blue.
Richest browns are a combination of lycopene (pink) with
Linda Mann east TN USA zone 7b