alternative to chromium oxide for mirror finish?

Joined
Dec 8, 2019
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21
what are the finer compounds for a mirror edge from aluminum/chromium oxide to get a mirror finish? what can i do to improve the finish on my knives using only the compounds i have? i own red coarse, white medium, and green, which is my finest compound as of now. i need to get some black compound. any way to get a finer polish with just the green, whether it be with a solvent, or something else?
 
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