| Metol | |
|---|---|
phenol_sulfate.PNG/200px-P-(methylamino)phenol_sulfate.PNG) |
|
| IUPAC name | 4-(methylamino)phenol sulfate |
| Other names | N-methyl-p-aminophenol sulfate, p-(methylamino)phenol sulfate, monomethyl-p-aminophenol hemisulfate, Metol, Elon, Rhodol, Enel, Viterol, Scalol, Genol, Satrapol. IUPAC Nomenclature is a system of naming Chemical compounds and of describing the science of Chemistry in general |
| Identifiers | |
| CAS number | [55-55-0] |
| Properties | |
| Molecular formula | (C7H10NO)2SO4 |
| Molar mass | 344. CAS registry numbers are unique numerical identifiers for Chemical compounds Polymers biological sequences mixtures and Alloys They are also referred to A chemical formula is a way of expressing information about the Atoms that constitute a particular Chemical compound, and how the relationship between those atoms changes Molar mass, symbol M, is the Mass of one mole of a substance ( Chemical element or Chemical compound) 38 g/mol |
| Melting point |
260 °C (? K) |
| Boiling point |
(? K) |
| Solubility in water | ? g/100 ml (?°C) |
| Viscosity | ? cP at ?°C |
| Hazards | |
| Flash point | ?°C |
| Except where noted otherwise, data are given for materials in their standard state (at 25 °C, 100 kPa) Infobox disclaimer and references |
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Metol is a developing agent used in b&w photographic developers. The melting point of a solid is the temperature range at which it changes state from solid to Liquid. The boiling point of a liquid is the temperature at which the Vapor pressure of the liquid equals the environmental pressure surrounding the liquid Solubility is the characteristic Physical property referring to the ability of a given substance the Solute, to dissolve in a Solvent. Water is a common Chemical substance that is essential for the survival of all known forms of Life. Viscosity is a measure of the resistance of a Fluid which is being deformed by either Shear stress or Extensional stress. The poise (symbol P pwɑːz is the unit of dynamic Viscosity in the Centimetre gram second system of units. The flash point of a flammable liquid is the lowest Temperature at which it can form an ignitable mixture in air In Chemistry, the standard state of a material is its state at 1 bar (100 Kilopascals exactly In Film developing, photographic developer (or just developer) is a chemical that makes the Latent image on the film or print visible In its pure form, it is a solid rather light-sensitive chemical which is the half sulfate (hemisulfate) salt of N-methyl-p-aminophenol. A solid' object is in the States of matter characterized by resistance to Deformation and changes of Volume. A chemical substance is a Material with a definite chemical composition. Salt is a Dietary mineral composed primarily of Sodium chloride that is essential for Animal life but toxic to most land plants It is still also commonly known by its old chemical name monomethyl-p-aminophenol hemisulfate.
Metol is an excellent developing agent for most continuous tone developer applications, and it has been widely used in published developer formulas as well as commercial products. However, it is difficult to produce highly concentrated developer solutions using Metol, and therefore most Metol developers are supplied in dry chemical mix. A developer containing both Metol and hydroquinone is called an MQ developer. Hydroquinone, also benzene-14-diol or quinol, is an Aromatic Organic compound which is a type of phenol, having the Chemical This combination of agents provide greater developer activity since the rate of development by both agents together is greater than the sum of rates of developments by each agent used alone ( superadditivity). Photographic developer solutions may contain more than one developing agents such as Metol and Hydroquinone, or Phenidone and Hydroquinone. This combination is very versatile; by varying the quantities of Metol, hydroquinone, restrainer, and adjusting the pH, the entire range of continuous tone developers can be made. Therefore, Metol replaced most other developing agents except for hydroquinone, Phenidone (which is more recent than Metol), and derivatives of Phenidone. Phenidone (1-phenyl-3-pyrazolidinone is an organic chemical compound whose primary use is as a Photographic developer. Notable formulas include Eastman Kodak D-76 film developer, D-72 print developer, and D-96 motion picture negative developer.
Alfred Bogisch discovered in 1891 that methylated p-aminophenol has more vigorous developing action than p-aminophenol, and Julius Hauff introduced this compound as a developing agent. (Hauff operated a chemical business for which Bogisch worked. ) Exact description of Bogisch and Hauff's early Metol is indefinitive, but it is most likely methylated at the ortho position of the phenol group (p-amino-o-methylphenol), rather than at the amino group. Some time after, Metol became to mean N-methylated variety and o-methylated variety had fallen out of use. Aktien-Gesellschaft fuer Anilinfabrikation (AGFA) sold this compound under trade name Metol and it became by far the most common name, followed by Eastman Kodak's trade name Elon.
Because it has been in use for this purpose for over 100 years and often by amateur photographers, there is a wide body of evidence about the health problems that contact with Metol can cause. A photographer is a person who takes a Photograph using a Camera. These are principally local dermatitis of the hands and fore-arms as well as some evidence of sensitization dermatitis in which subsequent exposure triggers of a chronic condition that is resistant to medication. Dermatitis is a Blanket term meaning any " Inflammation of the skin" (e The use of Metol in highly caustic solutions and the presence of other materials in darkrooms that have been implicated in dermatitis such as Cr(VI) salts may exacerbate some health impacts. In Chemistry, a solution is a Homogeneous Mixture composed of two or more substances Hexavalent chromium ( Cr(VI) compounds are those which contain the element Chromium in the +6 Oxidation state. A salt, in Chemistry, is defined as the product formed from the neutralisation reaction of Acids and bases.
References
External links
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