Perspiration Stains
Perspiration stains usually appear as yellow stains in the underarms and on the back, and may have a noticeable odor. Perspiration is composed of mainly water, but it also contains other substances, such as chloride salts, amino acids, and ammonium compounds. These substances can oxidize with the heat of the drying cycle or the heat of pressing, causing the stains to turn yellow. Perspiration begins as acidic substance but later decomposes to an alkaline condition. Silk is very susceptible to becoming discolored by alkaline substances.
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