a practically fast electroless copper plating solution is provided by adding a specific monoamine as an accelerator . the accelerator should be a tertiary monoamine and cannot be a diamine , does not have a complexing ability for copper ion , and does not contain a ketone or carboxyl group or an unsaturated group . specific examples of such monoamines include triethylamine , tripropylamine , tribenzylamine , n - methyl - piperidine , and tris amine , n - methylmorpholine .