This test method is similar to the description given in Standard Methods for the Examination of Water and Waste Water 4 and is referred to by many as “APHA Color.” The preparation of these platinum-cobalt color standards was originally described by A. This was accomplished in 1952 with the adoption of Test Method D1209 using the platinum-cobalt scale. Several expressions for defining “water-white” gradually appeared and it became evident that a more precise color standard was needed. 3.2 For a number of years the term “water-white” was considered sufficient as a measurement of solvent color.
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