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THE reducing properties of hypophosphite for metal ions have been known since 1844, but not until 1946 did Brenner successfully apply the principle to produce a practical plating method. In the following year, the engineering department of General American Transportation Corporation wished to obtain a cheaper tank‐car plating than the usual one of nickel‐clad construction. The Brenner method was considered, but proved unsuitable, and a process was developed which is now known by the trade mark Kanigen.