Copper Foil Lifting
by Christa Leach
(Gauteng, South Africa)
I would like to know if copper foil can become old and not be suitable for glasswork? I bought some foil from our local craft shop that specialises in Stained Glass products. I find that this particular roll I am busy will now, keeps on lifting when I start to solder. I do clean my glass properly with surgical spirits and I take special care with burnishing my pieces, yet the foil keeps on lifting. I also noticed that as soon as I start soldering, it looks like little bubbles appearing on the foil, causing the soldering to look ghastly!!
What am I doing wrong?Answer
I don't think you're doing anything wrong. You most likely have a defective roll of foil. Take it back and get another roll. As with any product, foil can be defective.
And yes, it could be old. If it has been exposed to heat, like sitting in the sun for several years, it looses it's ability to stick tight.