Environmental causes of photo damage include light, heat, and humidity. Ultraviolet light (sunlight) causes prints, especially color prints, to fade. Photos displayed in normal household conditions will suffer a progressive color shift in the highlight areas. In addition to light, heat causes deterioration., The higher the temperature, the quicker a print will be affected by fading and cracking. Avoid storing photos in outdoor storage sheds, attics, and the like. Another environmental component of damage is moisture. High humidity can lead to a much shorter life for photos by encouraging mold and mildew growth.