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In page Cordite:

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An important development during World War II was the addition of another explosive, nitroguanidine, to the mixture to form triple-base propellant or Cordite N and NQ. The formulations were slightly different for artillery and naval use. This solved two problems associated with the large naval guns fitted to British Navy's capital ships: gun flash and muzzle erosion. Nitroguanidine produces large amounts of nitrogen when heated, which had the benefit of reducing the muzzle flash, and its lower burning temperature greatly reduced the erosion of the gun barrel.[citation needed]