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Pyrotechnic smoke compositions for visual obscuration containing boron carbide, potassium nitrate, potassium chloride, and various lubricants are described. Only the waxy lubricants stearic acid and calcium stearate slowed the burning rate into a range suitable for end‐burning smoke grenades. For compositions pressed into steel cans, the addition of just 2 wt‐% calcium stearate was shown to reduce...