Uploaded July 2018 | Updated September 2026, 2 weeks ago

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The copper chloride flame. See the 2 colours (green hot going to cooler blue) in burning sugar cube version. Dissolve CuCl2.2H2O in ethanol (amazing it dissolves). Drip onto a sugar cube supported on a steel bottle top (plastic insert burned out previously). Use webcam to project onto screen to show class.