In a nut shell and straight from the Tour Van... The Jet Black finish soaks into the pores of the 8620 metal and "seals" them off from rusting. The raw finish that is a result of removing the black (did mine with distilled white vinegar) is a much darker finish than a true raw wedge from the tour or wedge works.
So y’all are saying if you clean off the finish of the jet black models with CLR you leave a “raw(er) finish that won’t rust? I love the look of the matte bare metal look that some of you have that removed the black but I do not like rusting wedges. What keeps it from rusting?
I'm sure in true GolfWRX fashion there will be somebody with more knowledge of the process and go into much more detail than needed. LOLOLOLOL