Metol
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| Metol | |
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| General | |
| Systematic name | 4-(methylamino)phenol sulfate |
| Other names | p-(methylamino)phenol sulfate, monomethyl-p-aminophenol sulfate, Metol, Elon |
| Molecular formula | (C7H10NO)2SO4 |
| SMILES | ? |
| Molar mass | 344.38 g/mol |
| Appearance | ? |
| CAS number | [55-55-0] |
| Properties | |
| Density and phase | ? g/cm³, ? |
| Solubility in water | ? g/100 ml (?°C) |
| Melting point | 260 °C (? K) |
| Boiling point | ?°C (? K) |
| Acidity (pKa) | ? |
| Basicity (pKb) | ? |
| Chiral rotation [α]D | ?° |
| Viscosity | ? cP at ?°C |
| Structure | |
| Molecular shape | ? |
| Coordination geometry |
? |
| Crystal structure | ? |
| Dipole moment | ? D |
| Hazards | |
| MSDS | External MSDS |
| Main hazards | ? |
| NFPA 704 | |
| Flash point | ?°C |
| R/S statement | R: ? S: ? |
| RTECS number | ? |
| Supplementary data page | |
| Structure and properties |
n, εr, etc. |
| Thermodynamic data |
Phase behaviour Solid, liquid, gas |
| Spectral data | UV, IR, NMR, MS |
| Related compounds | |
| Other anions | ? |
| Related compounds | ? |
| 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 (or Elon, in Eastman Kodak parlance) is a developing agent used in photographic developers. In its pure form, it is a solid rather light-sensitive chemical which is the sulfate salt of para-(methylamino)phenol. It is still also commonly known by its old chemical name monomethyl-p-aminophenol sulfate.
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. 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. The use of Metol in highly caustic solutions and the presence of other materials in dark-rooms that have been implicated in dermatitis such as Cr(VI) salts, may exacerbate some health impacts.
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