| 摘要 |
<p>Ag dye bleach prepn. for a photographic Ag dye bleach process contains organic S cpd(s). (I) of the formula (I), (II) and/or (III). In the formulae R1 is H, Me, Et, -SO3Na, Cl or -NH-CO-CH3. R2 is H, Me, Et, -COOH, Cl, -NH-CO-CH3, -SO3Na or O. R3 is H, Me, Et, -COOH, -SO3Na or p-NaO3S-phenylene. Pref. the solubility of (I) is min. 4 x 10 power -4 mole/l prepn., whilst the (I) vapour pressure in the bath is below the odour detection limit. The required antioxidant effect is obtd. without odour formation.</p> |
