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100 yr old coppper patina removal for solderability

What is the best way to remove 100 old copper patina, so I can solder (50/50) it ?

Ed Wloszek
architectural sheet metal - Berkley, Michigan, USA
2005

Ed,
I assume by now you have figured out that any abrasive will take the patina off. I would also assume that you are trying to minimize the amount of patina you need to remove for soldering, so I depending on the area to be soldered, I would think a narrow block with sandpaper would work very well. If you are doing a larger area, then some form of power sander would work quickly. I would recommend using a fairly fine abrasive so you do not cut through any thin areas.
Good luck,

JR Vanderburg
- Portland, Oregon, USA
2005

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