Developer for processing black and white photographs and method of manufacturing of a working solution thereof

摘要

The invention relates to developers for black and white film and photographic materials. The offered photographic developer for black and white photographs comprising: disodium salt of ethylenediaminetetraacetic acid, diatomic phenol, phenidon or 4-Methyl-1-phenyl-3-pyrazolidinone, sodium sulfite, alkali metal hydroxide, potassium bromide, water, boric acid salt or boric acid, benzotriazole, polyatomic alcohol or derivative thereof of general formula R1 - (CH₂CH₂)-Z-A-R2, where Z=O or is absent, A=(CH₂CH₂)n, R2, R1-OH, CH₃ or R1-OH, R2-, OCH₃, n=0,1, having the following % ratio of the components: disodium salt of ethylenediaminetetraacetic acid - from 0.2 to 1; sodium sulfite - from 2 to 10; diatomic phenol - from 1 to 8; benzotriazole - from 0.01 to 0.4; polyatomic alcohol or its derivatives - from 0.1 to 4; sodium or potassium hydroxide - from 1 to 8; phenidon or 4-Methyl-1-phenyl-3-pyrazolidinone - from 0.1 to 1; boric acid salt and an alkali metal or boric acid - from 1 to 6; potassium bromide - from 0.01 to 1; water - the rest. The developer provides leveling effect and increased light sensitivity without increasing graininess.