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Well the most eficient for me is SIC powder on a hard surface - glass or like i do - ceramic floor tail on the smooth side .
As the hone is flat i use a fine wet sandpapr to polish it on a glass ....

Yes the softer kinds , are intresting realy , because theyre faster and doesnt clugs so mutch .
But for finisher i prefer hard a hell and very fine .

I have few jaspers - lidyte ,rusian jasper white and black , 2 green jaspers from Bulgaria and 1 cretan hone witch is something like it . They all varie in grit , properties , speed and scratch...