取消并取代ISO建议R 32-1957及其修正案1-1966。建立一个标记系统和一系列颜色，用于识别气瓶内的物质。如果是气体混合物，气瓶应具有组成混合物的气体的适当颜色，这些颜色从阀门端可见。

Cancels and replaces ISO recommendation R 32-1957, and its amendment 1-1966. Establishes a system of marking and a series of colours for the identification of the content of gas cylinders. In the case of gas mixtures, the cylinder shall bear the appropriate colours for the gases comprising the mixture, such colours to be visible from the valve end.