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>  [Hereinafter I am going by older British industrial cylinder colours.]
>  In the long ages when sport divers have used air only, they have got far too
>casual about cylinder colours. Time was once when aqualung cylinders in
>Britain were almost always grey with black-and-white top quarters, that being
>the standard colour for breathing air. (Plain grey was industrial compressed
>air for power tools etc.) But ever since aqualung filling stations have come
>everywhere so divers don't have to go to industrial cylinder fillers and
>testers such as British Oxygen any more. I have seen aqualung cylinders yellow
>(chlorine), blue (argon or nitrogen), once even a striped brown pattern that
>correctly meant `carbon monoxide'. And other people talk about different
>official colour patterns in different countries. And divers want yellow for
>obviousness in dark water. It seems that the only good solution is to paint
>the name of the required gas in the cylinder in clear legible understandable
>WORDS, not the modern vogue for hieroglyphs.

I checked the current european (or maybe international =all but the US(ISO))
standards for cylinder marking. The colours are:

Black  = N2
White  = O2
Brown  = He
Red    = H2
Blue   = N2O
Grey   = CO2
Gree   = Ar

Yellow = poisonous
Red    = flamabe

Mixes are shown by combined colours..
The body of the tank are to be gray for breathable gasses and black for other
gasses (black is at least recommended). Tanks for portable breathing apparatus
are to have white, yellow or orange body.

All tanks are shall be labeled by the filler. Tanks may have its contents
written in large print on the sides.

/Sten

/Sten Meyer

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