Files are collections of documents on a similar subject or resulting from similar transactions which are held together in some way, usually by a file pin in a folder. Deterioration of paper Paper is mostly made up of cellulose fibres derived from plants. In neutral and alkaline environments paper remains stable for a long time but can deteriorate quickly if it comes into contact with acidic substances.
Most modern papers contain ingredients that form acids which can cause the breakdown of cellulose.
When paper deteriorates in this way it becomes very brittle and discoloured, like old newspapers, and eventually disintegrates on touch. There are certain types of papers which are more prone to rapid deterioration. Papers which are acidic or made from low quality fibres are more likely to deteriorate quickly. Acid attacks the plant fibres in paper and weakens it. Some impurities cause papers to darken when exposed to sunlight and oxygen from the environment.