Posted by Andreas Grund on August 09, 1998 at 12:59:48:
In Reply to: Re: Toning posted by John Fiorillo on August 03, 1998 at 18:59:18:
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.