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Used for clear, light yellow liquids, this definition originates from the use ofPt-CoDilute solution with a concentration range from0(Light color) to500(Dark color). Standard testing methodsASTM D 1209, AOCS Td 1b-64, ISO 2211, ISO 6271, BS5339This color code is widely used for water quality analysis and colorimetric determination of clean oil, chemicals, petrochemical products such as glycerol, plasticizers, solvents, carbon tetrachloride, petroleum alcohols, etc.1892yearHazenThe doctor first discussed it in the American Chemical AbstractsPt-CoStandard color preparation method, thereafterPt-CoThe color code is thereHazenChromaticity standard orHazenCompany; American Public Health Association(APHA)Standard methods for water and wastewaterPart 2120The same method was also adopted in China. So when conducting water quality classification,Pt-CoColor codes are generally equivalent toAPHAColor code.
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