Abstract
WE have repeated the experiment described by Christomanos1, and observe the formation of good Liesegang rings in all cases on clean, pure silver and other more noble metals; but either no rings, or badly distorted ones, on less noble metals and silver alloys. If the silver surface is previously darkened by exposure to sulphide, the rings are distorted but none the less appear in most cases. If, however, the clean metal is previously heated to darkening, or dipped in hydrogen peroxide solution, the rings that are eventually formed are decidedly inferior.
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