Some stains that have been hidden by soil are revealed after cleaning. These stains, which did not immediately cause discoloration, are often from spilled liquid containing colorless sugar that remained on the fibers. After long exposure to the air, they changed to insoluble brown stains and they often remain unnoticed because of the accumulated soil covering them. Some food and drink stains may inevitably turn even darker from the necessary drying action after a thorough cleaning.
Other kinds of stains can be caused by water soaking through and dissolving materials that cause browning...
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