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It's just a few dollars and you mix it one tablespoon to one cup of water so a little bottle will darken a whole lot of copper.
I discovered a few things while experimenting last night.
First, it works great on very clean copper. Any contaminants make it splotchy.
Second, liver of sulphur doesn't work on brass - only copper.
Third, I was wrong about my trim pieces. They're not brass plated copper - they're copper plated brass! I don't doubt they did this to get the nice dark brown surface possible with liver of sulphur.
Unfortunately, some of that copper plating is gone do to over polishing so I can't get a nice even dark surface. So I'm just going to clean up the original trim the radio came with for now.
I'm considering getting some copper sulfate (Zep root killer) and re-copper plating the new trim I picked up so I can darken it properly.
Finally, boy does this stuff stink!
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