| 摘要 |
This invention relates to a fixing bath containing a biologically degradable complexing agent of formula I <IMAGE> (I) wherein R1-4 represents hydrogen, C1-C10-alkyl, hydroxy-C1-C10-alkyl, C1-C10-alkoxy-C1-C10-alkyl, carboxy-C2-C10-alkyl, dicarboxy-C1-C10-alkyl, carboxy-hydroxy-C1-C10-alkyl, hydroxy-C1-C5-alkyl-(oxy-C1-C5-alkyl)n, or C1-C5-alkoxy-C1-C5-alkyl-(oxy-C1-C5-alkyl)n, M represents hydrogen, lithium, sodium, potassium or ammonium, and n represents 1, 2, 3 or 4, the iron(III) complex salt of which does not impede electrolytic desilverisation during the regeneration of spent fixing bath.
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