IN THE USA OXYGEN CYLINDERS ARE COLORED OXYGEN GREEN(SOMEWHAT LIGHTER THAN BRITISH RACING GREEN). YELLOW IS THE COLOR OF BREATHING AIR. ARGON IS BROWN, HELIUM BLUE. THESE ARE C.G.A. STANDARDS (COMPRESSED GAS ASSOCIATION) IN THE US. IT'S APPARENT FROM READING THIS FROM THE LAST FEW DAYS THAT THERE IS NO INTERNATIONAL STANDARD. CHEERS
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