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Many people enjoy a cup of nicely brewed coffee or tea. Most of us always look forward to their next mug, but we all dread taking it from a cup with stains. Serving visitors tea in stained cups is a ...
The dark brown stain in your mug or cup is brought about by tannins. Tannins are plant compounds found in tea and coffee (and some other foods and drinks) and are what give these hot drinks and ...
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