Abstract
The tarnishing of silver in halogen vapors, particularly iodine vapor, has been studied as a function of reaction temperature, halogen pressure, silver purity, and concentration of foreign vapors in the halogen atmosphere for reaction times up to several hours. The reaction temperature range studied was 25°–150°C for reactions in iodine and up to 200° in bromine and chlorine. In pure halogen vapor the reactions follow the familiar parabolic rate expression and are proportional to the square root of the halogen pressure. In the presence of small partial pressures of water or carbon tetrachloride vapor, however, the tarnishing rate is suppressed and is independent of the tarnish film thickness.
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