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I thought the idea of marking cylinders was to prevent contamination and confusion. Without accepted, recognizable identification, cylinders could inadvertently be filled with "dirty" gas. Or worse, a less than scrupulous diver could do it on purpose for his own convenience. Then when he goes back to the nitrox facility . . . What about the facility that rents nitrox cylinders? How do they keep their rented out cylinders from being incorrectly refilled elsewhere? Then when the next diver rents it, what does he get? The labels also let everyone, not just the physical posessor identify the nature, if not the specific contents. There is a chain of posession here and cylinders do change hands. Tape does fall off.. If I never *thought* a cylinder would leave my control, I could put Argon, CO2, Helium, in it. Why can't I assume a cylinder is what it says it is? Can I dive a cylinder with no markings and no tape as a compressed air cylinder? Or do I now have to analyze everything? Depth and date? With no agreement on p02's or anything else, I want to know the *contents* of the tank, not what someone's idea of its depth limit is. That, within certain broad bounds is for me to choose. Markings protect. How are they construed as "unsafe" or "anti-survival"? Art (rat) Smith
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