1:1 water:white vinegar. Soak with some old nails or keys for a few weeks - you'll see the colour change and intensify. I put a copper pipe on top but it didn't have much effect. It's useful to put things in a transparent container so you can see underneath.
Hey presto:
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| From underneath |
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| Love how the screws show up |
Looking forward to take this further in the future.
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