Black and gold using gosiba acid

[Betty2]

Oxidbeize gosiba german oxidizing liquid

I just purchased some of the German silver oxidizer recommended by Harold O’Connor. It arrived without any or precautions to take when using the liquid. The label is in German. Does anyone use this product and know the how too’s of using this product? I found it on the Karl Fischer web site item #7669. Unfortunately every page regarding this product was in German which I can’t read. Thanks, Estelle Vernon