Our teacher demonstrates the art of soldering on one of her pieces. The first step was to wrap copper foil around all the pieces, apply flux and then you're ready for the solder.
Then she passes the torch to me. It was very hot. 700 degrees F. If you linger a little too long on the seam you are soldering, you run the risk of cracking your glass.
Phew! It survived. She told me the messy parts will come right off.