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Photography is a very complex form of art which uses standard chemicals and scientific equations It is a chemical reaction which occurs when light hits a film or paper emulsion An emulsion is part of the film or paper which is very sensitive to light This is also the part where the chemical reaction takes place In an emulsion are small crystals of silver halide silver bromide silver chloride or silver iodide Eaton George These chemical crystals react with light when it is passed through a camera to create an image on paper Foto Info The development of film production has a very simple chemical equation most widely known as Light AgX Ag X This equation expresses how when any form of light is added to silver X it creates silver plus the X Mad Scientist In most cases the AgX represents one of the compounds above In the photographic process there are three main chemicals used These are the developer the stop bath and the fixer The developer or the reducer is the chemical that completes the reaction with the light exposure by reacting with the silver to create metallic silver Britannica Online This process is called reduction Common reducers used are hydroquinone phenidone metol pyro and absorbic acid If you combine two of these reducers it creates superadditivity Some common combinations are metol and hydroquinone which produce MQ or phenidone and hydroquinone which produce PQ Foto Info Each of the chemicals used in the developer have their own specific qualities and features When hydroquinone is used alone it can be a very slow reducer When metol is used it brings out detail very quickly Phenidone is almost never used by itself If it is combined with hydroquinone it keeps detail but at the same time it increases contrast If used alone it is very fast but has low contrast One of the less commonly used of these developers is pyro This
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