I’ve got a kidney shape, copper rev war canteen that I haven’t used in quite a long time… I rinsed it out, and then I took a penlight and put it inside the canteen and I saw all kinds of green blue oxidation inside… talked with a few guys from the gun club and they said that green blue stuff is poisonous… Is there anyway to salvage this canteen? Can it be cleaned out and can you drink water from it… Or will that stuff kill you and never go away… Help… I hate like hell to get rid of it but it sure beats pushing up daisies… Would a stainless steel canteen be better or a tin one be better? … would appreciate your comments and help.