What happens when you take compounds of strontium, copper and calcium, dissolve them in ethanol and then spray the resulting solutions onto a bunsen flame? Well you get some distinctively coloured flames (crimson red, green and orange), then if you're not careful, you set fire to the desk.
Different metals and metal compounds often give uniquely coloured flames when burned, based on each element's characteristic emission spectrum. For this reason they are commonly used in fireworks to get a variety of different colours during displays.
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