Colored smoke can be used for signals often in a military context. It can be produced by grenades or by various other pyrotechnical devices. The mixture used for producing usually a cooler-burning formula based on potassium chlorate oxidizer lactose or dextrin as a fuel and one or more dyes with about 40-50% content of the dye. About 2% sodium bicarbonate may be added as a coolant to lower the burning temperature.
Smoke released from aircraft was originally based on a mixture of 10-15% dye 60-65% trichloroethylene or tetrachloroethylene and 25% diesel oil injected into the exhaust gases of the aircraft engines. Most commonly teams now use specifically prepared liquid dyes and only gas oil light mineral oil or a food grade white oil without harmful chlorinated solvents.
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