In response to Peter Coggins' inquiry how to remove the silver backing
from a mirror...

Try using a weak solution (5-10%) of nitric acid.  I don't know the
dimensions of the mirror in question, but immersion of the mirror in
the acidic bath is recommended.  One could fabricate a temporary tray
by constructing a wooden framework of 2 X 4's and then drape heavy
guage plastic sheeting over and into the frame to provide a shallow
tub for the soak process.

Exercise all precautions when working with acid - wear protective
goggles, clothing and gloves.  Remember the cardinal rule of chemistry:
when mixing, always add the acid to water - NEVER add water to acid!

Alan Fox
Santa Barbara, CA

 [ I still remember that from high school chemsitry:
 [
 [ "Always do as you ought-er"
 [ "Add the acid to the water"
 [
 [ Adding water to concentrated acid can be quite spectacular.  I've
 [ seen a demonstration of this and you'd better hope that your
 [ protective gear works really well!!! -- Jody