Digital BW, The Print

Hi John. I believe that there is more than one type of whitener that
can be used. Some are more expensive than others, is my understanding.
Perhaps there are also differences in these that allow far longer
effectiveness. In any case the yellowing (or actually non-blueing) can
be from fading of the OBA such that the natural paper color comes
through Or can, as in the case of EEM, be from the acid content of a
paper rising due to breaking down of it's lignans and the destuction
of the paper over time, in addition to the early fading of it's OBA
content.

Regards
Duane


--- In DigitalBlackandWhiteThePrint@yahoogroups.com, "djon43"
<djon43@...> wrote:
>
>  

> 
> I'd like to know why one 100% rag paper would have problems with
> whitening and another would not. 
>  
> 
> John 
> 
>