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Wiktionary

deflagrating spoon

deflagrating spoon: noun

A long-handled spoon with a cover, lowered into a glass vessel filled with a gas to demonstrate deflagration.

A piece of metal (sodium) of the size of a pea is placed in a deflagrating spoon, and heated in the blowpipe-flame to redness. Suddenly immersed into a jar containing half a pint of chlorine-gas, it burns with a bright yellow flame to chloride of sodium.