3 primaries to 144 colors
I posted the result in July. Here is the process.
Winsor Yellow, M. Graham Quinacridone Red, French Ultramarine, on the diagonal. Initial and secondary mixes.
The upper mixes are 75/25%, predominately the upper primary. The lower, 25/75%. The larger chart follows the same formula.
From these mixes, the subsequent chart yielded 144 hues from a 3-color palette.
Alternately, Winsor Yellow, Permanent Rose, Winsor Blue, oddly less saturated, pastel results. Lovely.