What is a common characteristic of chemical tests used during upholstery cleaning?

Chemical tests conducted during upholstery cleaning play a crucial role in identifying the different fiber types present in the fabric, which directly influences the cleaning methods and products to be used. Understanding the fiber type is critical because different materials may react uniquely to specific cleaning agents or methods. For example, natural fibers like cotton and wool require different handling compared to synthetic fibers like polyester or nylon.

By determining the specific type of fiber, professionals can tailor their approach to ensure effective cleaning while minimizing the risk of damage to the fabric. This assessment helps in selecting appropriate cleaning solutions that suit the fiber’s characteristics, leading to more effective stain removal and overall cleaning.

It's important to note that while non-invasive methods and enhancing durability are desirable traits in upholstery cleaning processes, they are not characteristics specifically attributed to chemical tests. Likewise, improving color fastness may be an outcome of proper cleaning, but it is not a universal result of performing chemical tests. Therefore, option B accurately captures the essence of why these tests are foundational to the proper care of upholstery fabrics.