I made a list and sampled what I thought were my essential oil colors:
Cadmium Yellow Pale
Cadmium Yellow Medium
(Cadmium Yellow Deep)
Cadmium Red Light
Cadmium Red Medium
Cadmium Red Deep
Manganese Blue Hue
I made some discoveries:
I didn't have Cadmium Yellow Deep and think maybe I can get along without it
Cadmium Red Med and Deep look the same -- all these years I've bought both! I think of the money I could have saved if I'd done this color array 35 years ago...
(yes, I can't believe I've never done this before - silly me)
So my 20 essential colors are now 18 essential colors.