Description
This Method is applicable only to crystalline white sugars and is used to determine the photometric grade of white sugar in relation to the Braunschweig colour-types by measurement of the ratio of reflectance at two different wavelengths. A photometer calibrated using either Braunschweig colour-types (primary standard) or ceramic tiles (secondary standard) is used for the reflectance measurement. The Method is most suited to sugar with a mean aperture (MA) of (0.5 to 1.0) mm It is unsuitable for white sugars with inhomogeneous crystal distributions (e.g. sugars with damaged crystals), large (e.g. coarse sugar) or very small (e.g. powdered sugars). For sugars having colour type values of up to 4.85, the absolute difference between two results obtained under repeatability conditions should not be greater than 0.14 and under reproducibility conditions not greater than 0.55.
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Conditions of Use
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Method Abstract
Please click here to open ICUMSA Method GS2-13 (2024).
