Originally posted by jframe:
FGII, I'm surprised that the AIC would tell you that. But if they say so.....
Jo,
I framed my first collector plate in 1992 so I am not necessarily condoning a practice that is over 10 years old. My suggestion is based on a combination of what the AIC said way back in the early '90's and a bit of horse sense.
What would there be on a collector plate that silicone adhesive could possibly damage? I have torn apart one plate that I framed for a display back in '92 and I examined the surface of the plate back where the adhesive had been placed under 30X magnification and also with my naked half blind eyes and I could detect no apparent visible damage to the glaze on that one plate.
My concern was back then that the adhesive not turn brittle or harden to the point that I had to chip it off of the plate if the need arose. The silicone served this purpose quite nicely as it came off very easily and left no visible signs of removal or of being on the plate at all.
I am simply saying that, in certain cases where the only conservation concerns would be maybe dropping the item and breaking it, any item that would have an impervious surface should be OK to mount using something that we don't normally use in the framing trade.
I can't prove that outgassing would have or not have any negative effects on a fired glaze or on glass for that matter. But, I would be the first to bow to tangible proof that this process is the wrong thing to do with an impervious surface such as glass or hard fired glaze.
In light of what we have learned in the last 10 years about methods we considered "correct", I would not argue with anyone's study on the long term effects of silicone on this type of surface.
Framerguy