Digital BW, The Print

> ... using the Epson R800 ... happy with its black and
> white results ...

> All of the sudden... my prints start to come out 
> with a annoying pinkish tone...

That sounds like a fairly typical experience for trying to use color
pigments to generate B&W prints.  I'd guess most of us tried to do so at
some point and gave up.  That's a major reason why the dedicated B&W inksets
exist.

More specifically, the major issue is whether the image is composed mostly
of neutral (warm, actually) carbon or not.  The 2400 with the carbon based
LK and LLK inks can also make good B&W images.

For top quality B&W, most recommend printing with an inkset that uses
predominantly carbon to make neutral images.

Paul
www.PaulRoark.com