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Why would you try some cleaning method that is not supported by the industry and may harm your brass?
Why are so many spending so much time on an activity that can be fully addressed by simply taking a rag and wiping off the case exterior?
The purple could be manganese from you tap water.
If you must soak your brass in something, try warm/hot water and a little Dawn.
Personally, I'll stick with 30 minutes in 20/40 corn and not try to compete on the "Shiny Brass" contest circuit.
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