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i check as well for corrosion or flash rusting in my steel tanks. Dive shops normally have that policy to VIP a cylinder once you bring it in empty. This is matter of safety. safety for the blender who is filling your tanks, safety for the shop making sure they are covered in the event the diver is not breathing contaminated air or nitrox. Safety for the diver.
john chatteron has blog titled " Send lawyers, guns and money" Very interesting read.
You bet it is SAFETY. That is why a good op doesn't even charge for that quick peek making sure no contaminants got into that empty tank.