My Year 7 class left brine in evaporating dishes next to a sunny window. Several pupils ended up with dishes like the one pictured. We could explain the salt crystals at the bottom of the dish, but why is there no deposit around the middle of the dish when the rim is thickly furred with salt?
Mr Holden and 7Y2, St Thomas More School, Crewe, Cheshire, UK
This article appeared in print under the headline 鈥淔urless midriff鈥�
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