Digital BW, The Print

--- In DigitalBlackandWhiteThePrint@yahoogroups.com, "S.Martin" 
<view_camera@y...> wrote:
> UC is I assume Ultra-Chrome 
> Ink but what about the "pk" and "mk"? 

In the context of colour, RGB and CMY denote the primary and 
secondary colours.  As B is already used, K is used for black.  PK is 
therefore photo black and MK is matte black.

John