What is the main concern with cellulosic materials in carpets when exposed to moisture?

The primary concern with cellulosic materials in carpets when exposed to moisture is the browning effect. Cellulosic fibers, such as those derived from cotton or rayon, are particularly susceptible to moisture. When these materials retain water, they may undergo a chemical reaction known as hydrolysis, which can lead to the formation of discoloration, commonly referred to as "brownout." This condition is often irreversible and can significantly detract from the appearance of the carpet, leading to customer dissatisfaction.

Moisture can also encourage the growth of mold and mildew within the fibers, contributing to the browning effect and further damaging the carpet’s visual appeal. It's crucial for professional carpet cleaning technicians to be aware of this issue and take preventive measures, such as ensuring proper drying processes, especially when cleaning or maintaining carpets that contain cellulosic materials.