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Scientists have discovered ways to mitigate the forming of the film. Unless you are an intolerable aesthete, you have nothing to worry about.īut I am an intolerable aesthete! It’s still not the end of the world. The worst thing it does is slightly hinder the tea’s aroma. The film is flavourless and harmless to consume. And when this happens, a film tends to appear at the surface of the tea cup. These have a habit of bonding with calcium carbonate in tap water. Scientists at the Institute of Food, Nutrition and Health in Zurich, discovered that tea leaves contain compounds called polyphenols. Really? Clearly you don’t read the scientific journal the Physics of Fluids, because that’s all anyone there can talk about.įine then, talk me through it. Your partner may hate you, but it has been revealed that tea scum is caused by a simple chemical process. I always put that down to my partner stirring my tea with a dirty spoon because they hate me. What actual thing? You make a cup of tea and let it sit for a few minutes, only to be confronted by a grotesque waxy film on the surface when you bring it up to your mouth. Although “tea scum” may sound like something that a violent coffee enthusiast may spray paint on the front door of someone who prefers PG Tips, we’re talking about the actual thing. Is this some sort of horrible slur? No, not at all. Appearance: A grotty, cuppa-topping oil slick.