Digital BW, The Print

--- In DigitalBlackandWhiteThePrint@yahoogroups.com, Jeff Medkeff
<medkeff@g...> wrote:
> Joe Davajon wrote:
> 
> 
> > since Wilhelm's tests are based on fluorescent lighting, they in no
> > way reflect accurately what we can expect for print life for our
> > prints which are exposed to daylight which is much stronger lighting.
> 
> 
WIR test rating do not contitute ratings in term of absolute years of
display.

Here's what WIR has to say about it's own test procedure:

"What WIR had brought to the market is a standardized test procedure
for years of display for noticable color fading or color shift across
product lines.

There is an analogy between WIR's test procedure and the miles per
gallon rating used by the automobile industry: a true apples to apples
comparison."  

We should not take at face value WIR's permanence ratings anymore than
we take the mpg ratings of the auto industry. Each is designed to
serve as a basis for comparison.

The key word here is comparison, not absolute years.

Cheers,
André