New silver dye-bleach catalysts and the process for their manufacture are provided. These compounds have the general formula ##STR1## wherein A is an electron-withdrawing group and R.sub.1 and R.sub.2 are hydrogen, optionally substituted alkyl or optionally substituted aryl.
新的
银染料漂白催化剂及其制造过程已经提供。这些化合物具有一般公式##STR1##其中A是一种电子吸引基团,R.sub.1和R.sub.2是氢、可选的取代烷基或可选的取代芳基。