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Gardner Liquid Color Standards are used as a reference standard in the ASTM C40 and AASHTO test methods for determination of organic impurities in fine aggregates. The standards are an alternate option for the Organic Impurities Test Set. Individual reference standards are available in five Gardner colors noted in the test method. The liquid is securely sealed in 0.47x4.6in (11.9x116mm) Dia.xH glass tubes marked with the Gardner number and packaged in a protective case. Shelf life of each color standard is five years. Liquid Color Standards are available as follows, inquire for other colors:
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