Armstrong's mixture is a highly sensitive primary explosive. Its primary ingredients are red phosphorus and strong oxidizer, such as potassium chlorate and potassium perchlorate. Sulfur and calcium carbonate might be present in small amounts, though other additives are also used. Commercially, Armstrong's mixture is used in extremely small quantities on the paper caps in toy cap guns. It has also been considered a suitable mixture for the primer used in guns after boron carbide has been added.
Read more about Armstrong's Mixture: Safety Considerations
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