How does light from incandescent or fluorescent lights fade the dye in natural fibers such as wool and cotton?
Many light sources contain invisible ultraviolet rays, which can alter the chemical structure of dyes and cause fading. The ability of a fabric to resist color changes from exposure to light is a function of several factors, including the type of dye used, the fiber content of the fabric, the type of the light source (artificial/natural, direct/indirect), and the length of exposure. Most dyes will eventually fade from exposure to sunlight or artificial light. Fading will typically occur more rapidly on exposed areas such as shoulders, collars, and sleeves. Many blue, green, and lavender dyes are more light sensitive, especially on wool and silk. It is important for the manufacturer to select a dye that’s appropriate for the fabric and its end use. The consumer needs to take reasonable precautions to minimize exposure to light, including during storage and hanging.
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