| 摘要 |
<p>The present invention relates to an alkaline aqueous black-and-white photographic developer composition comprising: (1) at least one black-and-white developing agent, (2) at least one black-and-white auxiliary developing agent, (3) at least one antifoggant, (4) at least one sequestering agent, (5) a sulfite antioxidant, (6) at least one buffering agent, and (7) a tone modifying agent, wherein said tone modifying agent is an alkali metal or ammonium salt of a polythionic acid.</p> |
