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Old 14th October 2020, 11:45
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Varley Isle of Man Varley is offline
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Join Date: Apr 2017
Location: Isle of Man, G.B.
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I don't think one is supposed to use boiling water and ground coffee. If one's coffee was even mildly acidic then it would react with the calcium carbonate of the shell and increase the pH. I wonder what the compound would be Calcium coffinate?

I would be surprised if it wasn't swamped by any but the 'softest' of hot water.

(Second mug now enjoyed and I am done with coffee for the day).
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