I wanted to electroplate my house key to differentiate it from my garage key and back door key. So... yeah.
SCIENCE!!!I used a 9V battery, a 1974 penny, and a solution of salt and white vinegar. I connected the key to the positive terminal of the battery, and the penny to the negative terminal, and let SCIENCE do its work.
I didn't like that result, so I gave it a second coating, then polished it by burying it in a mound of salt with vinegar poured over it, letting it sit for a minute. Then I washed it off and gently buffed it (don't want to buff it too much or I might remove the copper entirely).
The final result is pleasing.
Finished product:Great success!!!