OK, on this thread's advice I tried the CLR product as my wife had some in the laundry room. New pipe turned out bright and shiny, old oxidized pipe cleaned up considerably with a pinkish hue. I think I'll try again on this oxidized piece (my 2" column pipe) using the ASK HOW recommended method of squeezing half a lemon and adding KOSHER Salt to make a slurry that you then rub onto the oxidized areas.
Once COPPER PORN is achieved, how do you keep it that way? I researched that a bit and found this excellent paper out of the UK:
Clear Protective Coatings for Copper and Copper Alloys, Publication TN41, 1991http://www.corrosionist.com/pub-41-clear-protective-coatings-for-copper.pdfIt recommends a product called INCRALAC which is a product that provides a non-dulling formulated protective coating with the addition of benzotriazole as a corrosion inhibitor.
The International Copper Association has funded the development of coatings specially formulated for use on copper and its alloys. This work has resulted in a number of recommendations but the only coating available commercially as a direct result of this work is "Incralac". "Incralac" is a solvent-based, air drying acrylic resin coating which can be applied by any of the methods commonly used for solvent-based coatings. It contains an addition of benzotriazole which acts as a most effective corrosion inhibitor ensuring that the underlying metal will not tarnish even where the film is damaged. It has a high clarity and is resistant to degradation by ultra-violet light.
Talasonline.com had the best prices I could find in 30 minutes of GOOGLING and a huge variety of related products, ie., cleaners, polish, rags, etc.
They carry INCRALAC in several forms (water based, solvent based, aerosol can,):
http://apps.webcreate.com/ecom/catalog/product_search.cfm?ClientID=15&SearchType=Keyword&SearchField=incralac&x=-410&y=-27Cheers Copper Porn'ers!