Ricoh Ri 4000 User Manual page 72

1. Before You Begin
 Additional Tips (Improvement of whiteness)
If you want to print more whiteness, you can increase the whiteness by following the steps below.
Click the [Metamode], and then select the print mode.
Click [Settings] under "Advanced" on the [Color] tab. And, select white print mode
[White: 1200x1200 16pass BiDir 2bit] or [White: 1200x1200 16pass UniDir 2bit].
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RICOH Ri 4000 User Manual