Rust damage can arise from the nature of the paper used in wrapping or separating the articles in the cases in which they were packed. Certain papers contain various salts and in one case rusting, at first believed to be due to contact with salt water, was found upon analysis of the wrapping paper to be due to salts consisting of aluminium, calcium, potassium, and sulphates being present in the paper. A test of the paper showed that it burned with some difficulty owing to the presence of these salts. See also under individual headings.
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