The ASTM colour of petroleum products applies to products having an ASTM color of 0.5 or darker, including lubricating oils, heating oils anddiesel fuel oils. (For products having an ASTM color lighter than 0.5, use the Saybolt Chromometer.) To determine ASTM color, the sample is compared against standard color discs in the Petroleum Colorimeter.
ASTM Colour: For the visual determination of the colour of a wide variety of petroleum products, such as lubricating oils, heating oils, diesel fuel oils, and petroleum waxes. Saybolt Colour: Determines the colour of refined oils such as undyed motor and aviation gasoline, jet propulsion fuels, naphthas and kerosine, and, in addition, petroleum waxes and pharmaceutical white oils.