Film information carriers are based polymer film deposition and surface Tu organic photosensitive materials, suitable for fungal decomposition. Particularly photosensitive surface of the film most vulnerable to fungal attack. Photographic film emulsion layer photosensitive film also vulnerable Moisturization hydrolysis, damage film images, Mold, Streptomyces excretion of oxalic acid-like substances can affect erosion silver particles and dye image. Dye images in high humidity conditions will be to hydrolysis and high humidity have prompted the residual chemicals on the film screen damage. The air of harmful gases such as sulphides, peroxide, even in small concentrations, and will pose harmful effects. Silver peroxide is caused by the dehumidifiers.com.cn/News/HumidityConcept/" target="_blank">oxidation of particles images main reason, colloidal silver color with the formation of plaque deposits. Other such as paints and gas activity volatile compounds will be damaged and film-based imaging. In addition, the chemical activity of the dust will make pictures fade or form smirch. 2-20 years to preserve some of the Negative microfilm appeared minor stain or blot, the silver image is partial dehumidifiers.com.cn/News/HumidityConcept/" target="_blank">oxidation, Colloidal Silver result showing yellow or red spots. This is from the air of oxygen, water vapor and atmospheric gases of harmful peroxide, ozone, sulfur dioxide, hydrogen sulfide and other industrial emissions cause.

  Photographic negatives in storage, will release itself known as acid gases, the acid corrosion, yellow film on the first began deteriorating, and then all the colors start changing color and falling off. Finally the film itself has been damaged. The damage process called "acid syndrome." Therefore, the photographic film not only need moisture-proof, the need to maintain a clean environment.

  Low humidity environment can be avoided photographic film Mold and mitigation image dye bleaching, But humidity low humidity or frequent changes in the cycle, lower unit will be based emulsion layer and the attachment, the emergence film edge spalling, Qu vol emulsion layer cracking phenomenon. And high-temperature environments will film color gray hair, loss level

  Photographic film preservation of national standards :

  Photos file management standard GB / T 11821-89

  6.1.1 Depositary film suitable temperature and humidity for : temperature 13-15 ¡ã C, relative humidity 35% to 45%. 6.1.2 Depositary photographs suitable temperature and humidity for : temperature 14-24 ¡ã C, relative humidity 40% to 60%. 6.4.3 of the Treasury circadian changes in the relative humidity is greater than ¡À 5%. Film processing has safety film storage technology GB 9049-88

6.1.1 interim storage conditions (for at least 10 years) 6.1.2 of the long-term storage conditions (permanent preservation) flu-lamellar-type humidity temperature ¡æ flu-lamellar-type humidity ¡æ black-and-white film Sunburn tree fiber-based unit 40% to 60% "20 black-and-white film tree fiber-15-50 Sunburn film" 20 black-and-white film of polyester film base 40% to 60% "20 black-and-white film polyester film base 30-50 "20 Color film Sunburn tree fiber-based unit 40% to 60%" five color film tree fiber Sunburn 15-40-film "five color film 40% to 60% of polyester film base" five color film polyester film base 25-40 "5 Note : The standard storage conditions for the medium-term relaxation of the ceiling of 60%, otherwise the standards impossible to enforce. However, the incidence of fungal conditions can be seen that 60% is already unsafe areas. In fact so long as the relative humidity of 40% control, we will be able to reach safe storage purposes.