Occasionally after carpet or rug has been cleaned a brownish discoloration can appear. A cause of this discoloration is the condition called cellulosic browning. In order for this discoloration to develop, several factors must be present — a cellulosic fiber, moisture, and slow drying. A high pH or shampoo residue may also contribute to its occurrence.
Cellulosic fibers are present in all jute carpet or rug backings and are a major source of cellulosic browning. The drying time following carpet cleaning depends on humidity; during rainy periods and summer months, the air contains more moisture, making it more difficult for the moisture in the carpet to evaporate...
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