Whistle mix
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Whistle mix is a general term to refer to any pyrotechnic composition which emits a whistling sound when pressed into a tube and ignited. It is used as a rocket propellant, particularly in small bottle rockets.
Whistle mix tends to be fast burning and brisant; therefore it is also used as burst charge.
It is commonly composed of 70% Potassium perchlorate and 30% Sodium benzoate (Measured by weight).
Past compositions contained chlorates and gallates, but these were too sensitive and have been replaced by compostitions such as the above formula.