The measurement of the purity of refined sugar, known as ICUMSA numbers; lower numbers indicate a higher level of purity in the refined sugar.
ICUMSA is the International Commission for Uniform Methods of Sugar Analysis. The International Commission for Uniform Methods of Sugar Analysis (ICUMSA) was established in 1897 to create international standards for sugar quality classification. In order to produce a common international language of sugar purity, the ICUMSA developed a colorimetric method of measurement that allows producers to quickly and easily categorize their products in accordance with global guidelines.
An ICUMSA rating is an international unit for expressing the purity of the sugar in solution, and is directly related to the color of the sugar. There are different types of ICUMSA units, due to the fact that color results from the specific manufacturing processes to which sugar is subjected; the more processing sugar cane is subjected to, the more color is removed, and the final pigmentation of the product reflects the degree of processing to which it has been subjected.
Sugar Volume versus Weight Conversions