Digital BW, The Print

----- Original Message -----
From: <sdmey4@...>
To: <DigitalBlackandWhiteThePrint@yahoogroups.com>
Sent: Wednesday, November 27, 2002 3:40 AM
Subject: Re: [Digital BW] Wilhelm Ultrachrome Ratings


> In a message dated 11/26/2002 6:34:28 PM Pacific Standard Time,
scho@...
> writes:
>
> > Wilhelm has rated the ultrachrome pigments (9600) on cotton rag papers
> > at approx. 70-80+ years for full color prints and >100 years for B&W
> > prints on the same papers with the same inks.  The B&W prints were made
> > using the color inks, not black only.  I may have missed the fine
> > print, but why the difference?
> >
>
> I have read That black and white prints made with IP5 on the x600 printers
> don't use any yellow ink at all. So I 'm sure this lack of yellow ink in
> black and white printing explains the differance in Whilhelm years, Not
sure
> how the epson driver handels the black and white chores. Removing the
Yellow
> inks seems to be the answer for metamerism issues.
> Steve Meyers

As black and grey are to the yellow side the use of yellow can be limited in
a B&W Ultrachrome print.
The main reason that Ultrachrome B&W will perform better in fade tests than
Ultrachrome C must be the
extreme replacement of the CcMmY composite greys by Black and Grey inks.
However up to 20% there still should be cmY in the greys. This is in the
normal Epson driver, IP5 shouldn't have any Y in the whole range.

Ernst