What might indicate a malfunction in an impulse cartridge?

Discoloration on the outer casing of an impulse cartridge can indicate a malfunction. Impulse cartridges, which are used in various munitions systems, are designed to operate under specific conditions, and any visible changes like discoloration can suggest that the cartridge has been compromised. This might be due to degradation from environmental factors or exposure to unsuitable conditions, which can affect the cartridge's performance and reliability.

While other factors can relate to issues with munitions, discoloration is a direct visual cue that something may be wrong with the cartridge itself. It's important to inspect munitions carefully before use, and any unusual appearances, like discoloration, should prompt further investigation to ensure safety and effectiveness.