High Quality Content by WIKIPEDIA articles! Congo red is the sodium salt of benzidinediazo-bis-1- naphthylamine-4-sulfonic acid (formula: C32H22N6Na2O6S2; molecular weight: 696.66 g/mol). It is a secondary diazo dye. Congo red is water soluble, yielding a red colloidal solution; its solubility is better in organic solvents such as ethanol. It has a strong, though apparently non- covalent affinity to cellulose fibres. However, the use of congo red in the cellulose industries (cotton textile, wood pulp

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