Dektol is a classic methol-hydroquinone developer. It is used for processing black and white photo papers. The developer is economical and convenient to work with, has a good resource. From one package, 1 liter of stock solution (concentrate) is obtained. Before use, the concentrate is diluted with water in a ratio of 1:2 or 1:3. The concentration of the working solution affects the processing time and image contrast.