Canadian Firearms Practice · Question
A 'cleaning patch' that comes out of the barrel with a green or blue tint generally indicates the presence of:
Many copper solvents react with copper fouling from jacketed bullets, turning the patch blue or green.
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Question: A 'cleaning patch' that comes out of the barrel with a green or blue tint generally indicates the presence of:
Answer options:
- Lead fouling ✅ Copper fouling
- Excessive moisture
- Burned gunpowder
Correct answer: Copper fouling
Explanation: Many copper solvents react with copper fouling from jacketed bullets, turning the patch blue or green.
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