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The element boron produces a lovely green flame, as long as you avoid contamination with sodium which has a bright yellow flame that tends to overwhelm other colors. Boric acid is a conveniently available boron compound. You can mix it with alcohol and burn it. Very lovely. But of course, be safe. Fire can spread if you do not handle it with care.

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10y ago
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6y ago

Blue color in flame tests: indium, selenium, arsenic, copper from CuCl2.

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12y ago

sulphur or copper

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Q: What mineral burns with a blue flame?
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