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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
722:). This combination is very versatile; by varying the quantities of Metol, hydroquinone, and restrainer, and adjusting the pH, the entire range of continuous tone developers can be made. Therefore, this form of Metol replaced most other developing agents except for hydroquinone,
772:
Because it has been in use for this purpose for over 100 years, and often by amateur photographers, there is a substantial body of evidence regarding the health problems that contact with Metol can cause. These are principally local
524:
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717:
is called an MQ developer. This combination of agents provides greater developer activity since the rate of development by both agents together is greater than the sum of rates of development by each agent used alone
745:-aminophenol. Hauff introduced this compound as a developing agent. The exact composition of Bogisch and Hauff's early Metol is unknown, but it was most likely methylated at the ortho position of the benzene ring (
777:
of the hands and forearms. There is also some evidence of sensitization dermatitis, in which repeated exposure triggers a chronic condition that is resistant to medication. The use of Metol in highly
726:(which is more recent than Metol), and derivatives of Phenidone. Notable formulas include Eastman Kodak D-76 film developer, D-72 print developer, and D-96 motion picture negative developer.
622:
158:-methyl-p-aminophenol sulfate, Pictol, p-(methylamino)phenol sulfate, monomethyl-p-aminophenol hemisulfate, Metol, Elon, Rhodol, Enel, Viterol, Scalol, Genol, Satrapol, Photol.
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816:
Gerd Löbbert "Photography" in
Ullmann's Encyclopedia of Industrial Chemistry, 2005, Wiley-VCH, Weinheim.
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Alfred
Bogisch, working for a chemical company owned by Julius Hauff, discovered in 1891 that methylated
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and the presence of other materials in darkrooms that have been implicated in dermatitis—such as
765:) sold this compound under the trade name Metol, which became by far the most common name, followed by
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753:-methylphenol), rather than at the amino group. Some time later, Metol came to mean the
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InChI=1S/2C7H9NO.H2O4S/c2*1-8-6-2-4-7(9)5-3-6;1-5(2,3)4/h2*2-5,8-9H,1H3;(H2,1,2,3,4)
714:
713:
developers are supplied in dry chemical mix. A developer containing both Metol and
697:
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InChI=1/2C7H9NO.H2O4S/c2*1-8-6-2-4-7(9)5-3-6;1-5(2,3)4/h2*2-5,8-9H,1H3;(H2,1,2,3,4)
84:
16:
Reducing aromatic compound used as developing agent in black and white photography
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761:-methylated variety fell out of use. Aktien-Gesellschaft für Anilinfabrikation (
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Except where otherwise noted, data are given for materials in their
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668:-methylaminophenol. This colourless salt is a popular
688:-methylaminophenol. It arises by decarboxylation of
51:. Unsourced material may be challenged and removed.
788:salts—may exacerbate some health impacts.
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684:Several methods exist for the preparation of
8:
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741:has more vigorous developing action than
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111:Learn how and when to remove this message
797:
419:O=S(=O)(O)O.Oc1ccc(NC)cc1.Oc1ccc(NC)cc1
416:
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696:). It can be obtained by reaction of
476:260 °C (500 °F; 533 K)
256:
388:Key: ZVNPWFOVUDMGRP-UHFFFAOYSA-N
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49:adding citations to reliable sources
398:Key: ZVNPWFOVUDMGRP-UHFFFAOYAW
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603:(at 25 °C , 100 kPa).
36:needs additional citations for
1:
757:-methylated variety, and the
147:4-(methylamino)phenol sulfate
893:
648:) is a trade name for the
466:344.38 g/mol
833:Harger, Rolla N. (1919).
692:-4-hydroxyphenylglycine (
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822:10.1002/14356007.a20_001
565:Precautionary statements
872:Photographic chemicals
835:"Preparation of Metol"
674:monochrome photography
670:photographic developer
769:'s trade name Elon.
45:improve this article
852:10.1021/ja01459a014
786:hexavalent chromium
125:
630:Infobox references
123:
840:J. Am. Chem. Soc.
652:with the formula
638:Chemical compound
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586:Safety data sheet
539:Hazard statements
341:CompTox Dashboard
205:Interactive image
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739:-aminophenol
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715:hydroquinone
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698:hydroquinone
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660:. It is the
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164:Identifiers
155:
153:Other names
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43:Please help
38:verification
35:
18:
708:Application
702:methylamine
592:Oxford MSDS
525:Signal word
428:Properties
263:100.000.216
225:CHEBI:55413
866:Categories
792:References
775:dermatitis
499:Pictograms
462:Molar mass
329:D3W0VWG12M
236:ChemSpider
192:3D model (
171:CAS Number
144:IUPAC name
71:newspapers
782:solutions
724:Phenidone
680:Synthesis
490:labelling
101:June 2019
672:used in
664:salt of
481:Hazards
877:Phenols
779:caustic
749:-amino-
730:History
662:sulfate
623:what is
621: (
531:Warning
456:
296:PubChem
181:55-55-0
85:scholar
60:"Metol"
694:Glycin
618:verify
615:
588:(SDS)
412:SMILES
284:C11206
138:Names
124:Metol
87:
80:
73:
66:
58:
804:GHS:
700:with
642:Metol
377:InChI
216:ChEBI
194:JSmol
92:JSTOR
78:books
763:AGFA
646:Elon
644:(or
575:P280
571:P260
557:H410
553:H373
549:H317
545:H302
320:UNII
309:5930
275:KEGG
245:5717
64:news
848:doi
818:doi
656:HSO
488:GHS
448:NO)
346:EPA
299:CID
47:by
868::
844:41
837:.
704:.
676:.
577:,
573:,
555:,
551:,
547:,
492::
452:SO
446:10
440:(C
854:.
850::
820::
759:o
755:N
751:o
747:p
743:p
737:p
718:(
690:N
686:N
666:N
658:4
654:2
613:Y
454:4
450:2
444:H
442:7
348:)
344:(
196:)
156:N
114:)
108:(
103:)
99:(
89:·
82:·
75:·
68:·
41:.
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