Nikon D6, Reference Manual

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Achieving Natural Colors with Different Light Sources (White Balance)
A 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 [
Incandescent ] is selected will make pictures
slightly “colder” but will not actually make them blue.
A
“Mired”
Values in mired are calculated by multiplying the inverse of the color
temperature by 10
6 . Any given 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