Digital BW, The Print

I agree.  As soon as I sent the message I remembered that I had one of those ph pens 
someplace.

Checked an archivally processed fiber based proof sheet from 1970 and indeed it was 
acid.  The prints from then are still great and were naively mounted on acid board.  Maybe 
the dry mounting protected them from the board?  I read once that the dry mount glue 
forms a barrier.

And I have no yellowing at all. Still beautiful.  My recollection is that yellowing is residual 
fixer???  of course I suppose a myiad of things could cause it.

and air borne?  acid is acid if it gets to where it hurts, whether "soaking in" or just there 
(i.e. closer).

On the other hand, this all has (may have) nothing to do with inkjet.  The inks either are or 
are not acid sensitive, independent of what ever silver grains are.

Scott

--- In DigitalBlackandWhiteThePrint@yahoogroups.com, "Paul Roark" <paul.roark@v...> 
wrote:
> 
> >The acid in the old prints probably means that they weren't washed enough.
> 
> I don't think so.  It was more than one print, they are my prints, and I was
> rather careful about thorough washing -- Perma-Wash, archival washer, etc.  
> 
> I think the problem is air-borne acids from other sources.  This is
> consistent with what RIT has found.  It apparently doesn't take much to
> start an acidic cascade in un-buffered fiber prints.
> 
> There is also a visible yellowing that goes from the edges to the center of
> the back of the 8x10 that was in the file cabinet.  At the center the paper
>