Abstract
The rate at which Ag tarnishes was measured under laboratory conditions which were realistic with respect to the levels of H 2S, SO 2 and water vapour found under natural conditions and show the need for caution in designing accelerated tests. The addition of SO 2 (2ppm) has no significant effect on the rate of sulphide formation on pure Ag surfaces at the 0·02–0·05ppm H 2S level in dry or moist conditions, but nullifies the enhancement of the rate caused by contamination of the Ag surface by Fe.
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