Light Light can be very damaging to a variety of materials.
A well-known effect is fading of pigments and dyes. This is also commonly observed on photographs, and military prints and watercolours which have been displayed in unfiltered and direct light. Subsequently the energy input of the UV-light will cause for instance depolymerisation of textile fibres. This can lead to the complete disintegration of cellulose fabric. Cotton is particularly vulnerable to light decay but many organic materials are affected, such as skins, paper, wood, ivory, feathers, fur, etc.