I left the brass bracelet in the fuming container much longer than recommended, and the colored patina you saw in October washed off. Now that I've pushed that patina past it's time limit, I'll revisit it again someday and see how long to fume it so the blue greens stay.
The moist sorrel washed off leaving nice colors on the copper sample.
My favorite new copper patina is shown below on flat and hammered copper samples. The fuming recipe is comprised of sea salt, cream of tartar, vinegar, and ammonia.
You'll be able to read more about the cream of tartar patina in my "Accessible Patinas" article in the upcoming zine which Catherine Witherell and Deryn Mentock are publishing. They are busy compiling all the articles together now for a January release. More details to come.
Another fun result from the copper patina experiments is a mottled blue / green from sal ammoniac and tobacco. The results lead me to wonder what would happen if I ground up the tabacco even finer before this immersion process.
Here's a closeup look at the flat piece after rinsing
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