Join Date: Jul 2008
Location: Dickinson, Tx. / Somerville, TX
There is a specific kind of backing sheet for a mirror. I can't remember what it is called but it some kind of acid resistance (I think). Just using ordinary paper or cardboard might be what caused the mirroring silver to degrade in the first place. I would think that picture frame shops would know what I am talking about. When I had my shop, I had a gazillion phone numbers at my fingertips but not no mo.
Retired woodworker, amongst other things, Sold full time cruising boat and now full time cruising in RV. Currently in Somerville, Tx