| 摘要 |
<p>Photographic developer replenisher concentrates comprising more reactive developers, like 4(N-ethyl-N-2-hydroxyethyl)-2-methylphenylenediamine (CD-4) undergo rapid oxidation, and consequently, have shorten shelf-life stabilities. Hydroxylamine type derivatives, while disclosed as being useful as a class of antioxidants for stabilizing photographic developer replenishers, most were found to impart either inadequate shelf-life stability for CD-4 developer, or interfered with 'satisfactory developer performance.' Surprisingly, it was discovered the shelf-life stability of replenisher concentrates comprising CD-4 photographic developer could be extended for periods of 2 years or longer, and also provide satisfactory developer performance when the hydroxylamine antioxidant comprises at least N,N-bis(2-sulfoethyl) hydroxylamine (SEHA) or a salt thereof.</p> |
