2010 reducer, Transparent base, Airbrush restorer.
Wicked: Det White, Det black, Det sepia, Det Moss green, Pearl gold, pearl silver
Createx: Pearl blue, Pearl white, Iridescent Red, IR yellow, IR green, Transparent brite yellow, T Red oxide, T Dark Brown, Flo yellow, Flo Sunburst, Flo Violet, (flo white)
Folkart: color shift red, green, and violet, titanium.
The Wicked detail colors can be made transparent by adding T base and reducer. White then pearls make an excellent base. Transparent, iridescent, and Flo can be layered to achieve many colors. IR and color shift make excellent highlights. T bright yellow turns silver to gold.
This list cuts out a lot of duplication, yet covers almost all your color wheel. Hope this helps.