Posted by John Fiorillo on August 09, 1998 at 20:14:32:
In Reply to: Re: Toning posted by Andreas Grund on August 09, 1998 at 12:59:48:
: Excellent explanation!
: Want to add, however, that buffered cardboard for matt and back is not the first choice, because the buffering capacity (usually Calcium carbonate) against acidic materials is only given for a few years. Therefore, under any circumstances, the serious collector should accept only museum quality cardboard. Although a little more expensive, the cost is only a small fraction of the cost of the print and such money for top quality matts and backs is really well spent.
Response from JF:
Thank you for the clarification!