Light Damage     

Two major factors to consider when deciding where to display works are wavelength and intensity of light exposure. Some light causes more violent reactions then others. The shorter the wavelength of light, the more damaging the chemical reaction. Long wavelengths, at the red end of the spectrum, produce heat, but emit little damaging ultraviolet radiation. It is the short UV rays that cause the most damage. Both ultraviolet radiation and visible radiation can make materials bleach out or become darker, and generally make objects deteriorate over time. The most effective way to reduce damage from light is to reduce both the amount of light and the duration of exposure.

A major factor in light damage is the intensity of the light. To reduce intensity, place curtains or blinds over windows, use low-wattage light bulbs or use fewer lighting fixtures. Also, limit the amount of time a piece of art is exposed to light. The more exposure, the worse the damage.

Not all objects are equally light-sensitive. Textiles are generally considered very light-sensitive, with silk being the most light-sensitive fiber. Oil paintings are categorized as moderately light-sensitive. Some particularly light-sensitive materials include inks in felt-tipped markers and ballpoint pens, pastels, watercolors and gouache; however, not all colors are equally light sensitive. Because works of art, particularly works on paper, are vulnerable to light damage steps should be taken to limit the amount of light these pieces receive. Remember, intensity and duration are very important considerations. Block out as much daylight as possible by using blinds, draperies or UV blocking film over windows. Don't forget to block out light from skylights. To help prevent heat buildup in the frame package, lights should be placed at least 4 feet from artwork.