Hi everyone

I'm trying to oxidise some sterling silver but the result isn't very pretty. The silver become a strange colour of black, green and brown.
I use sterling silver in a mixture of ½ L water, 7g. sulfur liver and 2g. carbamate. I followed the prescription on the product I bought to the purpose (sulfur liver)
And I'm sure that I have been working with the exact same product on a jewelry workshop.
I have no idea what I'm doing wrong. Maybe you have?

Kind regards
Bine from Denmark