do you have any tips on preventing brass and copper from tarnishing?
I brush my pieces with a 600 grade wet and dry paper and scotch mop,
and then paint on lacquer (Zaponlack) with a brush, but in the humid
conditions of Tel Aviv it tarnishes under the lacquer, or perhaps
where some grease somehow got in, or the lacquer was streaky.
Sometimes there are dark spots on the soldering join, I assume a sign
of a nonperfect soldering job/using easy solder. Can you help? Thanks.