Hi Bill, Nice link. But if you read the package on standard flux that is used for copper by plumbers it contains zinc chloride. I always used olic acid when soldering lead glazed windows. The hobby fluxes they sell in craft stores contain zinc chloride also. It sure does clean up tarnish on copper, and i guess lungs. I was not a professional plumber, but achieved a degree of success as a glazier. May be it is differant stuff, here below.
What is your glass work?
