Digital BW, The Print

6 weeks in CA sun through glass takes care of the brighteners.  Now that I
have the black light I can check to see if the brighteners are completely
gone...or have just partially gone by that point.  The yellowing is not
extreme...it just looks like a unbrightened paper.  Nonetheless it is
something that will change with time...something I'm trying to avoid.  From
what I've seen of your fading numbers my test is about twice the strength of
your 300 hour test...assuming no major reciprocity failure.

Robert

On 4/11/02 6:10 PM, "Paul Roark" <paul.roark@...> wrote:

> Mike noted:
> 
>> ... most Fiber Based photographic papers have brighteners are
>> yellow over time
> 
> In my fade testing I've seen no correlation between brighteners and fading.
> 
> Also, while many seem to think brighteners are a negative to longevity, I've
> seen no hard evidence that they reduce the paper's life.
> 
> I'm not sure there is any negative to brighteners aside from the fact that
> they will eventually "burn out" and cause the paper to yellow a bit.  In my
> tests the typical yellowing is about 3 units of 256, then the papers
> stabilize and do not further yellow.
> 
> Paul
> http://www.PaulRoark.com
> 
> 
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----------------------
Robert Morrison
rmorrison@...

310-397-2704

4131 Bledsoe Ave.
Los Angeles, CA 90066