HP PCL/PJL reference (PCL 5 Color) - Technical Reference Manual

C-14 Using Palettes (Color LaserJet, 5, 5M, DeskJet) EN
Bits/Index = 3 through 8
Index Color
0Black
1Red
2Green
3Yellow
4Blue
5 Magenta
6Cyan
7White
n > 7 Black