IICRC Upholstery and Fabric Cleaning Technician (UFT) Practice Exam 2026 - Free UFT Certification Practice Questions and Study Guide

Browning refers to the discoloration that occurs when lignin, a natural binder in cellulose materials like cotton and rayon, reacts with moisture, heat, or high pH environments. When lignin dissolves, it can release color and create a brownish stain on the fabric, affecting its appearance. This is particularly problematic in upholstery and fabrics, as it can detract significantly from the aesthetic quality of the material.

Understanding browning is crucial for upholstery and fabric cleaning technicians, as it informs the methods and products needed to treat stains effectively. Preventative measures, as well as proper handling and cleaning protocols, can help mitigate the risk of browning in fabrics that contain cellulose materials.