A more reliable approach is the fitting type. The CGA (Compressed Gas
Association) has devised a standard for fitting types to be used on
bottles for different contents. The use of left-hand vs. right-hand
threads, or internal vs. external threads, etc. is a much more reliable
approach to avoiding the use of the wrong gas. While not absolutely
foolproof, it certainly is a better approach than color coding by
itself. Naturally, it would be good to use both.
Permanent labeling (stamped into bottles) is also more reliable than
colors.
Regards,
Alan
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