dye couplers behind during developing. Both factors may lead to color changes over time. The three dyes, cyan, magenta, and yellow, which make up the print may fade at different rates, causing a color shift in the print. Modern chromogenic papers such as Kodak Endura have achieved excellent stability, however, and are rated for 100 years in home display. Dye destructionDye destruction prints are the most archival color prints, at least among the wet chemical processes, and arguably among all processes. The most well-known kind of dye destruction print is the Cibachrome, now known as Ilfochrome. Ink jetSome ink jet prints are now considered to have excellent stability, while others are not. Ink jet prints using dye-pigment mixtures are now common in photography, and often claim stability on par with chromogenic prints. However, these claims are based on accelerated aging studies rather than historical experience, because the technology is still relatively young. Types and causes of deterioration There are two main types of deterioration found in photographic materials. Chemical deterioration occurs when the chemicals in the photograph or negative undergo reactions (either through contact with outside catalysts, or because the chemicals are inherently unstable) that damage the material. Physical or structural deterioration occurs when chemical reactions are not involved, and include abrasion and tearing. Both types of deterioration are caused by three main factors: environmental storage conditions, inappropriate storage enclosures and repair attempts, and human use and handling. Chemical damage can also be caused by improper chemical processing. Different types of photographic materials are particularly susceptible to different types and causes of deterioration. Environmental factors Temperature and humidity interact with one another and cause chemical and physical deterioration. High temperature and relative humidity, along with pollution, can cause fading and discoloration of silver images and color dyes. Higher temperatures cause faster deterioration: the rate of deterioration is approximately doubled with every temperature increase of 10 °C. Fluctuations in temperature and relative humidity are particularly damaging, as they also speed up chemical deterioration and can cause structural damage such as cracked emulsions and warped support layers. Too-high relative humidity can cause fading, discoloration and silver mirroring, and can cause binders to soften and become sticky, making photographs susceptible to physical damage. It can also cause photographs to adhere to frames and other enclosures. Too-low relative humidity can cause physical damage including desiccation, embrittlement, and curling. Pollution can include oxidant and aciding/sulfiding