Before revision: The ASTM has detailed description and procedures in ASTM Designation D1209, "Standard Test Method for Color of Clear Liquids (Platinum-Cobalt Scale)".Designation D1209-00, "Standard Test Method for Color of Clear Liquids (Platinum-Cobalt Scale)," ASTM International, West Conshohocken, PA, 2000Hazen, A., "The Measurement of the Colors of Natural Waters," American Chemist Journal (18:264), 1896
After revision: Colour may be reported on a water quality report using this scale.The ASTM has detailed description and procedures in ASTM Designation D1209, "Standard Test Method for Color of Clear Liquids (Platinum-Cobalt Scale)".Designation D1209-00, "Standard Test Method for Color of Clear Liquids (Platinum-Cobalt Scale)," ASTM International, West Conshohocken, PA, 2000Hazen, A., "The Measurement of the Colors of Natural Waters," American Chemist Journal (18:264), 1896