I understand how condensation forms on a cup, but how does the condensation on the outside of the cup leave a stain with the same color as the liquid inside the cup?
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It’s not condensation, which wouldn’t form on a hot cup of coffee anyhow. It’s that a tiny amount of coffee remained on the outside of the cup after each sip, which runs down the cup and spreads out around the base. This is more common with coffee then with other beverages because of the difference in the mouth shape we make when sipping on something hot, and we’re trying not to burn our mouth, versus something cold. Also coffee is particularly adept at making stains that are highly visible, ensuring you notice anytime this occurs.
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