Color balancing : Recognizing the Color

This really brings back memories of the color darkroom! Have you done a color perception test, like this: Color Test - Online Color Challenge | X-Rite ? It might identify a very specific area where you have less acuity and this might help your color adjustment work.
(The 2 combinations of blue/magenta and green/yellow that I also find valuable in my ring arounds, are not inlcuded in the PS Variations)

Curious that you do these blue/magenta and green/yellow but you do not do red/yellow or magenta/red or cyan/blue etc. In other words you've selected only two out of six possibilities. The rational escapes me.

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