The publisher told me a few days ago that they resumed opening the
slide mounts because they get better quality that way. I really
don't know one way or another as I have never even seen a slide
scanner, let alone use one.

This is dumb. There is no technical reason which requires demounting.

Tony Thompson Editor, Signature Press, Berkeley, CA
2906 Forest Ave., Berkeley, CA 94705 www.signaturepress.com
(510) 540-6538; fax, (510) 540-1937; e-mail, thompson@...
Publishers of books on railroad history