Nikon D6 Reference Manual page 176

A
Fine-Tuning White Balance
To fine-tune white balance, use the multi selector while holding the U
button.
•
When an option other than [Choose color temperature] or [Preset
manual] is selected, you can fine-tune white balance on the amber-blue
axis by pressing 4 or 2 and on the green-magenta axis by pressing 1
or 3 .
• When [Choose color temperature] is selected, you can press 4 or 2 to
highlight a digit. Press 1 or 3 to change.
•
Release the U button to return to shooting mode.
• At settings other than 0, an asterisk (" U ")
appears in the rear control panel.
• To view the current value, press the U
button while shooting information is
displayed.
124 The U Button