Opaque materials are not inherently UV resistant; their protection depends on the specific material and additives used. Normal glass windows allow UV-A to pass while blocking UV-B and UV-C. Many opaque polymers and pigments can degrade under UV exposure, with red items being particularly prone to fading. Brighter and paler colors, as well as white, are more susceptible to sun damage, although all dyes eventually fade. When purchasing curtains, consider materials like polyester with UV protectors for better durability, and be aware that higher-quality options generally offer improved performance.
