RE: plexglass face mounting
Under plexi, face up (image side sticks to plexiglass). It's the first time that I hear plexiglass (more correctly: polymethyl methacrylate - plexiglass is a registered trade name) isn't archival. AFAIK, it is the material used in intraocular lenses (my mother has this kind of lenses inside her eyes because of her cataract problem) and hard contact lenses. I absolutely don't think they would put a material that clouds / yellows with time inside our eyes - would you? Plexiglass and acrylic medium are essentially the same material and again AFAIK acrylic paint / medium is considered as being quite stable / achival (depending on pigment of course). Probably all this depends on quality / make / impurities... I personally see high quality plexiglass as an archival material. Regards, Loris. -----Original Message----- From: Judy Seigel [mailto:jseigel@panix.com] Sent: 12 Aralık 2006 Salı 00:33 To: alt-photo-process-l@usask.ca Subject: Re: plexglass face mounting "Plexiglass face mounting" means mounting ON the plexi or UNDER the plexi, face up? Either way, I'm surprised there's been no mention of plexi discoloring (clouding, yellowing) in time -- maybe not in 5 years, but surely in 15 or 20. Unless there's a new plexi that's "archival"? J.
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