At a comparatively low temperature, gray tin may appear on white tin when the latter ( a ) is in contact with elementary germanium, ( b ) contains a certain proportion of germanium in the form of an alloy, or ( c ) is in contact with solutions in which certain germanium compounds have been dissolved. Data also are presented regarding the rate of spread of gray tin on white tin castings and coatings containing various proportions of germanium.
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Rogers et al. (1953) studied this question.
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