This method measures the reducing power of solutions of sugar products containing reducing substances, e.g. invert sugar in a weak alkaline solution of a Cu++ complex with tartrate.
Access to the online Version of ICUMSA Method GS1-5 (2009) can be obtained from the Sugar Industry Website, operated by Bartens. The online access for two years costs EUR35 (+ 19 % VAT for German and EU citizens without EU VAT No.).