Digital BW, The Print

"richardeskin" <richard.eskin@...> wrote:
>
> I don't remember back to your original post on this, but did you use tap water from a public drinking water system? 

Yes, I just used tap water.

> Regulations require some amount of residual chlorine at the tap.  That could cause fading.  If you used tap, you might wish to consider distilled or deionized water and repeat.


I agree, the chlorine was probably a prime factor.

I was not looking for fade with this experiment.  I was curious about migration, which would have caused the resolution lines to blur.  I was happy to see that on that paper -- Red River Polar Pearl Metallic -- there was no evidence of the migration problem.  The fade was a surprise.  

The fading I ran into reminded me of what Bob Zeiss did for a quick and dirty fade test -- dip a test strip into bleach.  See http://www.inksupply.com/fading.cfm 

Paul
www.PaulRoark.com 




> 
> --- In DigitalBlackandWhiteThePrint@yahoogroups.com, "Paul" <roark.paul@> wrote:
> >
> > ...
> > Bob Zeiss, who was (probably still is) an excellent engineer and experimenter, felt that bleaches could be used for accelerated fade testing. I'm not sure what bleach he uses, but one that operates based on oxidizing the stains seems logical.  One experiment I may try is to add a percentage of hydrogen peroxide (H2O2 -- see http://en.wikipedia.org/wiki/Hydrogen_peroxide ) to the water.  It's extra oxygen should accelerate the oxidation induced fading even more than just 100% humidity and whatever else was in the jar's air & water at the moment.  The closed jar with water and possible additive(s) in it would seem to give a way to get very even exposure to samples for good A v. B comparison.  Some quick and dirty way to test for sensitivity to oxidation seems useful.
> > ...