"The "art" of metal finishing goes something like this:
Example: mild steel Coarse grit, medium coarse grit, fine coarse grit, medium grit, fine grit, very fine grit, extremely fine grit, electroplate.
Each one of the steps takes the metal "grain" smoother than the last. If you were to magnify the surface you will see the grain of the metal "standing" up with high grain tops and low grain valley's, something like this, ^^^^^^^^, looking at a end view.
By finishing that surface we smooth that grain down to where the grain tops get closer to the grain valley with the above polishing compounds. The finest we can finish that surface grain structure is electroplating.
Electroplating is taking dissolved metal particles and applying it to "fill" in the grain structure to almost a mirror finish. I say almost because if you magnify a electroplated surface you will still see grain highs and lows.
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