DESCRIPTION: Fumaric acid is used as a flavoring, because it is the sourest tasting of the organic acids. Three parts of fumaric acid are as sour as five parts of citric acid. It is also used as an anti-oxidant, as a mordant ( a substance that helps dyes stick to fabric) , and as a buffering agent ( helps maintain a particular acidity or alkalinity) . SPECIFICATION: Properties Specifications Appearance: White powder Assay : 99.-100.5% Melting points: 294-300’ c Arsenic: 3mg/ kg max Heavy metal : 10mg/ kg max Maleic acid: 0.1% max Residue on Ignition: 0.1% max Water : 0.5% max