Xerox 6050 User Manual page 107

Setting Up [Print Density]
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Select [Print density] from the [System parameters] menu.
The Print density selections will display in the right pane.
Enter a positive or a negative number between -99 and +99 to set up the default
print density. Larger negative numbers lighten the prints. Higher positive numbers
darken the prints. The factory default setting is [0].
Press the [Apply] button to save the new setting, [Cancel] to revert to the
existing setting, or [Reset to default] to return to the factory default setting.