Are you protected? Most home windows come from the manufacturer with some level (60-70% reduction) of UV (Ultraviolet) protection. Unfortunately, you are going to need more than some protection if you plan on significantly reducing the fading process from the sun.
With all the emphasis on skin cancer, most people know that UV rays are harmful and can cause damage to furniture, paintings, hardwood floors and other valuables within your house. However, ultraviolet is only responsible for a portion of the fading. The other two large factors are direct visible light and heat. Many fabrics and woods are especially susceptible to color change from intense light over time.
People in the clothing, drapery, carpeting, upholstery and other textile related industries know that after fabrics are exposed to fluorescent lighting for a period of time, the color dyes used in fabrics fade. Have you ever browsed through clothing sections in a department store? The next time you do, look at the jackets, blouses, coats, and sweaters hanging on the racks. If they have been there for any length of time, you can spot the fading. Look along the hanger-line, and notice the amount of fading that occurs there. The same is true of clothing that has been overlapped on store shelves. To see the amount of fading, simply lift up the top article of clothing and look for the effects of fading on the one below it.
Visible Light is produced within the spectrum of electromagnetic energy that includes radio waves, microwaves, X-ray and ultraviolet (UV) rays. The cause of fading is due to a photochemical reaction involving UV and visible light.
Research has shown that 40% of fading is caused by UV rays. Another 25% of fading is due to heat, with 25% being caused by normal visible light. The remaining 10% cause of fading is from indoor artificial lighting, humidity, and poor dye anchorage. Visible light and UV radiation cause fading and a lack of moisture, especially in the cloth materials used to cover books.
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