A great way to wreck your prized photo, pastel, chalk sketch orwatercolor is to frame it by sticking it right against the glass orplastic, backing it with a sheet of cardboard and hanging it up.
Condensation on glass will pull emulsion from photos and pigmentfrom watercolors. Static electricity that builds up on plastic willpull the chalk or pastel dust right off the paper. Acid that occursnaturally in cardboard made from wood pulp will eat into the artworklike flame. That's what those brown spots on old photos are.
It broke my cheapskate's heart to have members of theProfessional Picture Framers Association drive it into my head thatthey have reasons for …
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