A question for those in the know. I have been handed a single clip of five MKVII rounds by a gentleman who was clearing a loft. I would like to pull the bullets, remove the cordite (as it should be) and make the primer safe. I believe the old primers were Fulminate of Mercury so what would be the best neutralising agent? I know that vinegar is sometimes recommended for BP or flash but would it be suitable for these old primers? Thanks in advance.