Why do not all kinds of bacteria leave coffee ring stains?
Almost a year ago Leonie Mueck posted as question of the month “Why does coffee form ring-shaped stains?“. The answer was: Coffee is a colloidal suspension in water. This means that a coffee drop on a hydrophilic surface is quite flat: It exhibits a large contact area with the surface and therefore retains a low contact angle at … Continue reading Why do not all kinds of bacteria leave coffee ring stains?
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