What effect can over-wetting the carpet backing have?

Over-wetting the carpet backing can intensify cellulosic browning, which is a significant concern in carpet care. Cellulosic browning occurs when moisture causes the breakdown of cellulosic fibers—often found in carpets made from natural materials like cotton or jute. When these fibers absorb excessive water, they can begin to degrade and oxidize, leading to visible browning stains that can be difficult to remove.

This phenomenon typically happens when carpets are not dried properly after cleaning or when too much water is used during the cleaning process. In professional carpet cleaning, maintaining the right level of moisture is crucial to prevent damage and maintain the appearance of the carpet. Understanding this concept is essential for a technician, as it influences both cleaning methods and post-cleaning care for carpets.

The other options do not accurately reflect the outcomes of over-wetting. While preventing fading and enhancing longevity or stain resistance would be beneficial outcomes, they are not directly associated with the risks of excessive moisture in carpet backing.