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The reaction of thiourea to dicyandiamidine sulfate on silver surfaces investigated by reflection-absorption infrared spectroscopy

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Abstract

The reaction pathway of thiourea degradation on silver surfaces was investigated with reflection-absorption infrared spectroscopy. Adsorption of thiourea from aqueous solution produces a thin stable thiourea film that is not removed by rinsing. Aging at elevated temperature results in conversion to dicyandiamidine sulfate. The same reaction product is observed on daguerreotypes that were treated with commercial thiourea based silver cleaner.

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Authors and Affiliations

  1. Max-Planck-Institute of Colloids and Interfaces, Rudower Chaussee 5, D-12489 Berlin, Germany, , , , , , DE

    D. G. Kurth

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  1. D. G. Kurth
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Received: 26 April 1999 / Revised: 7 June 1999 / /Accepted: 11 June 1999

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Kurth, D. The reaction of thiourea to dicyandiamidine sulfate on silver surfaces investigated by reflection-absorption infrared spectroscopy. Fresenius J Anal Chem 365, 465–466 (1999). https://doi.org/10.1007/s002160051641

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  • DOI: https://doi.org/10.1007/s002160051641

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