Nikon Z 8 Reference Manual page 151

Tip: White Balance Fine-Tuning
The colors on the fine-tuning axes are relative, not absolute. Selecting more of a color on a given axis
does not necessarily result in that color appearing in pictures. For example, moving the cursor to "B"
(blue) when a "warm" setting such as J [Incandescent] is selected will make pictures slightly "colder"
but will not actually make them blue.
Tip: "Mired"
Values in mired are calculated by multiplying the inverse of the color temperature by 10
change in color temperature produces a greater difference in color at low color temperatures than it
would at higher color temperatures. For example, a change of 1000 K produces a much greater change
in color at 3000 K than at 6000 K. Mired is a measure of color temperature that takes such variation
into account, and as such is the unit used in color-temperature compensation filters.
E.g.: Change in color temperature (in Kelvin) : Value in mired
4000 K – 3000 K = 1000 K : 83 mired
7000 K – 6000 K = 1000 K : 24 mired
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White Balance