Olivetti d-Color MF25 User Manual page 35

"Blue" parameter
This parameter can be used to adjust the degree of blue in the image to one
of 19 levels.
For details on the setting procedure, refer to "Adjusting the copy color quality
(Adjust Color parameters)" on page 8-36.
d-Color MF25
Original
– 3
Sample images
+ 3
x-33