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Not inherently. There are a number of compounds capable of imparting a greenish color to a flame; some of them definitely are highly poisonous, while others are less so. (In large enough quantities, practically everything is "toxic".) Boric acid, for example, can be used to make flames burn green, and as long as you're using it in a well-ventilated area it should be safe enough.

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10y ago

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