Primaries do not get diluted with white.

What I was implying was that you could reproduce a wider range of colors if
the primaries weren't as close to the center of the chart. Radial movement
represents changes in saturation -- dilution with white.

As for not knowing accurate color reproduction when you see it... What sorts
of preferences does the average viewer have? If you don't have the original
for comparison, it can be difficult to judge.

I never considered myself an expert in color reproduction, but your comments
have encouraged me to dig out Mees and give him another try. (I'm not
promising anything.)