Thanx all for your comments! I did end up using the black backed and it came out wonderful. The silver stuff was just thicker, and since my soldering is pretty decent, the strength is just fine. And Javahut was right, I guess I was looking for reinforcement(pardon the pun) with my instincts. I'm learning more and more to trust them!!
"Michele > color has no impact on strength. use black backed. You can get thicker foil,
I am creating a narrow 6' side light window made with all bevels. Someone told me to use this silvered copper foil as it is sturdier. I am using Strong Line for reinforcement. My concern is the aesthetics of the silver on the adhesive side of the foil. The patina will be black, and I am wondering how the silver will look on the backside through the bevel. Any opinions?
"Javahut" > > You really asking? or looking to have your first instinct reinforced?