I ‘d just watch the dry verdigris which have formed on those press studs, wet verdigris does little damage but is highly toxic, however as the chemical reaction develops it turns into a copper carbonate oxide layer which due to the cocktail of other chemicals involved can weaken the brass, and also make it very brittle. Basically the verdigris has got to the stage that its now start to breaking down the brass into its separate alloyed components.
Nige.
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