ASTM D6531 Tinting Strength of Aqueous Ink Systems

ASTM D6531 covers the methodology for deciding the relative coloring strength of water-based ink frameworks utilizing a PC helped spectrophotometer. The final results of this test method are expressed as per international standards in SI units.

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    ASTM D6531 coloring strength is a fundamental property of printing ink scatterings. Even though outcomes on mass colors don’t ensure equivalency of dry printed films, they give valuable parameters for quality control of creating clusters of bases and completed inks. Test results may likely be utilized for shading coordinating purposes.


    In ASTM D6531 test method a standard and different samples are each brought down to a similar focus in a white coloring base, then at that point, the samples are scattered on a paint shaker. The scattered examples are moved to cuvettes for reflectance estimations on a spectrophotometer. Shade and strength comparative with the standard color are figured.

    Specimen size

    Glass Jars, limit approx. 64 g, 33 mm in the distance across by 70 mm in tallness, with screw cap tops are used in ASTM D6531 test method. 


    Caluclation is done using the below formula in ASTM D6531 test method

    TS, % = [(1 – R∞) /2R] u ÷ [(1 – R)2 R]s × 100

    Where Ris the spectral reflectance factor, expressed as a decimal fraction or, by mutual agreement, an appropriate tristimulus value.


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