Digital BW, The Print

On 9/13/01 5:00 PM, "Paul Roark" <paul.roark@...> wrote:

> Actually, what both Jerry in his south-window testing and I with my
> florescent light fader seem to be seeing is that the colder the print, the
> better it does.  The MIS "blue" is composed of cyan and magenta pigments --
> no dyes.  The MIS cyan pigment looks to be amazingly stable.  (See the RIT
> test results at
> http://www.inksupply.com/index.cfm?source=html/rit.html )

Carbon black is much more light stable than any color pigment on the market.
The RIT results are mystifying unless the black ink has another color toner
in it that is not carbon black.  If this is the case they should get rid of
it and use the pthalo pigment (cyan)...which looks good.  The fact that the
"blue" toner is composed of two different pigments with dramatically
different fading profiles should be troubling to you.  Look at the huge
differential even in the "5-10" year range.  In practice these "year"
ratings are actually much shorter.  Almost no one takes into account the
environmental factors...they simply take the fad-o-meter light hours and
some type of conversion for likely exposure (usually very little).  Everyone
in the business knows that this doesn't cut it.  Prints toned with the MIS
"blue" will become progressively more blue as the magenta diminishes faster.
You're not likely to see this in 300 hours under a fluorescent light.

Robert

----------------------
Robert Morrison
rmorrison@...

310-397-2704

4131 Bledsoe Ave.
Los Angeles, CA 90066