The silver ones are copper with aluminum fins soldered with silver solder. Heat with a torch and knock the fins out. The other one is pure copper, but they use silver solder to hold the copper fins to the base. So goes as number 2.
Taking a vacation
The silver ones are copper with aluminum fins soldered with silver solder. Heat with a torch and knock the fins out. The other one is pure copper, but they use silver solder to hold the copper fins to the base. So goes as number 2.
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