Copper(II) Benzoate

Copper benzoate is the chemical compound with the formula Cu(C7H5O2)2. It is a light blue solid which may vary in tint, similar to basic copper(II) carbonate. It is mostly used in pyrotechnics, because of the blue flame it emits.

Synthesis
Copper benzoate can be made by combining aqueous solutions of potassium benzoate with copper(II) sulfate. Copper benzoate precipitates as a pale blue solid.

The primary use of this compound is in production of blue flame in fireworks. Copper benzoate made from sodium benzoate for use in fireworks may result in strong yellow dilution of the flame.

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