Abstract
The use of liquid ammonia as a solvent and reagent in conservation has been investigated, and the present paper reports its use for the stabilization of archaeological iron objects. It is shown that not only does liquid ammonia act in a solvent capacity, but it also converts insoluble chloride-containing iron corrosion products into chloride-free iron compounds and ammonium chloride, the latter being readily removed by washing with water under anaerobic conditions. Pre-treatment with liquid ammonia, followed by aqueous washing, has been shown to be both rapid and effective in the stabilization of marine cast iron artifacts with an initial high chloride content.
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