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Cesure,
Lemishine powder seems to be popping up all over. I just noticed it at my crappy grocery store by the dishwashing soap.
Citric acid is used in canning and wine making and beer brewing. Any store that sells canning jars should have it as well as any store that caters to vintners/brewers.
I would try a very mild solution to clean your verdigris. Say a 1/4 tsp in a gallon of warm water and watch carefully. Pink brass was over cleaned.
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