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Organic passivating chemicals for silver plated brass items



I have some items of brass that are electroplated with 10 micrometers of Ag. Some of them are passivated using an organic pasivating system and some are not. I have two questions on this.

1.Does anyone have any info on the organic passivating systems that are available for silver baths?

2. I need to separate the passivated from the others. One way would obviously be to expose them to sulfur-containing substances but I would like to avoid that. Does anybody have any other suggestion?

Thank you in advance

Hannes Medelius
- Stockholm, Sweden

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