Why did one side turn pink when the other three sides came out greenish-brown?
Md Ariful Islam
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এমবিএ(মার্কেটিং)
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Dr. Md Rushad Rahman
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পিজিটি(মেডিসিন)
Your problem is probably vinegar in the mixture. Acetic acid (present in vinegar) will "pickle" or slightly etch your copper, removing the patina. If you added more vinegar than necessary, or if the piece sat in a puddle of the mixture, this could cause the fresh pink copper color.
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