Chronopotentiometry using a solid tin cathode was used to study the interaction of the food dye erythrosin (2′, 4′, 5′, 7′ -tetra-iodofluorescein) with tin as an example of the application of this technique to the study of some aspects of tinplate corropsion. Erythrosin is reduced by tin in acid solutions to fluorescin, the reduced form of fluorescein, with the exchange of 10 electron/molecule. Erythrosin, inthe concentrations normally used in foods, makes a negligible contribution to the corrosion of tinplate.
