Digital BW, The Print

Hello again,

> Thanks Clayton - so what you're saying is that he's testing fading
>and not colour shift from yellowing of the paper?

Well,...that's not exactly what I said.  I was responding to your
question about why a non acid free paper gets a good rating.  An acid
containing paper isn't going to show acid stains for some years, lots
longer than his tests take.  So regardless of what he's testing for,
acid stains can't be a factor in his results.  That was the main point. 


>...colour shift from yellowing of the paper...

I'm not sure if by this you mean changing the over all look of the
print, or the ink tone color shifting because of paper yellowing.  My
observations are that the yellowing does not cause ink tone color
shifting, but certainly the look of the print changes.  Paper color
visually affects everything from highlights down to full coverage.  My
4 year old EEM Eboni BO print looks dingy, but the exposed ink has the
same color and density as that under the cover strip.

I don't really know if his testing takes paper color changes into
account.  I suspect not because if he did then EEM probably wouldn't
have scored so high because it's the worst offender.  So my guess is
that he's only testing for fading.  


Regards,
Clayton


Info on black and white digital printing at    
http://www.cjcom.net/digiprnarts.htm