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Kmaddock · 14th January 2018, 08:45 PM

Hi
There is tannic acid in coffee, and seemingly 30 other organic acids as well ( according to my quick google of “tannic acid in coffee”) I assume it is these that are doing the etching?
Ken

14th January 2018, 08:45 PM	#9
Kmaddock Member Join Date: May 2014 Location: Ireland Posts: 532	Hi There is tannic acid in coffee, and seemingly 30 other organic acids as well ( according to my quick google of “tannic acid in coffee”) I assume it is these that are doing the etching? Ken