Spills, snow and water tracked in, rain through an open window, pipes bursting, leaky radiators, floods and even overwetting by do-it-yourself carpet cleaners can wet out the backing yarns of carpeting.
Overwetting followed by slow drying allows dye-like materials to dissolve out of the backing yarns and "wick" to the face of the carpeting. The brown discoloration which forms is usually referred to as a water stain.
After a water stain has developed...
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