Edinol (4-amino-2- (hydroxymethyl) phenol, oxyaminobenzyl alcohol, paraaminosaligenin) is an organic compound derived from salicylic alcohol with the formula C 7 H 9 NO 2 . Used in photography at the beginning of the 20th century as a black and white developing substance .
| Edinol | |
|---|---|
| Are common | |
| Systematic name | 4-amino-2- (hydroxymethyl) phenol |
| Chem. formula | C 7 H 9 NO 2 |
| Molar mass | |
| Chemical properties | |
| Solubility in water | soluble |
| Classification | |
| Reg. CAS number | |
| PubChem | |
| Smiles | |
| Inchi | |
| ChemSpider | |
By the end of the 20th century, the name “Edinol” passed to the generic vitamin K [2] .
Content
Physical and chemical properties
Prokudin-Gorsky C. M. , Photograph from nature, 1903, “Perchrome” photographic plate shown in edinol with a dilution of 1:30 |
It is used in the form of hydrochloric salt, which looks like small colorless or slightly yellowish needle crystals [3] . Salt is highly soluble, especially in hot water. Solutions should be stored in well-closed vessels [4] .
Has a developing ability at a temperature of 7 ° C, at which hydroquinone loses its developing ability. At temperatures above 20 ° C it is very fast. The rate of manifestation of edinol is approximately equivalent to the rate of manifestation of three other fast developers ( 4-aminophenol , amidol and metol ]) [3] . The maximum concentration of the developer, after which the rate of development stops - 6 g / liter [5] .
Getting
Obtained by reduction of 4-nitro-2-hydroxybenzyl alcohol [6] [7] .
Application
| External Images | |
|---|---|
| Edinol Bottle | |
| A bottle of edinol concentrate of the early XX century , located here | |
It was used at the beginning of the 20th century as a black and white developing substance [3] [6] . It can be used both for the manifestation of negative and positive photographic materials (in various dilutions) [3] . Edinol gave mild negatives with a minimal veil [4] . Potassium bromide in the composition of the developer slows down the development process, but greatly reduces the veil [4] .
Good solubility allowed the creation of strong concentrates [4] . Bayer produced edinol concentrate in the form of a solution, which required the addition of potassium metabisulfite and potassium hydroxide to prepare the developer [3] .
Notes
- ↑ 1 2 ChemSpider - 2007.
- ↑ nDrugs.com .
- ↑ 1 2 3 4 5 Miethe, 1902 .
- ↑ 1 2 3 4 Laubert, 1917 , p. 15-16.
- ↑ Sheberstov, 1932 , p. 58.
- ↑ 1 2 Richter, 1922 , p. 316.
- ↑ Schering .
Literature
- Laubert Yu. K. Photographic recipes and tables. - M .: Printing house t-va I. D. Sytin, 1917.
- Sheberstov V. I. Fundamentals of the formulation of developing solutions and the choice of development conditions // Proletarian photo : magazine / article editor Chibisov K.V. - 1932. - December ( No. 12 ). - S. 53-60 .
- Miethe A. Edinol, a new developer substance // Anthony's Photographic Bulletin: Journal. - E & HT Anthony & Co, 1902. - January ( vol. 33 , No. 1 ). - S. 119-120 .
- Richter V. Organic chemistry or chemistry of the carbon compounds (neopr.) / Edited by Anschutz R. and Meerwein H. Chemistry of the carbocyclic compounds. - Philadelphia: Blackiston's son & Co, 1922 .-- T. II.
Links
- Edinol generic . ndrugs.com . Date of treatment July 21, 2017.
- French patent FR382367: Révélateur photographique (fr.) . Chemiche fabrik auf actien E. Schering (5 fevrier 1908). Date of treatment October 3, 2018.