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you need a set of stones but I would not advise you to get into honing just yet.
I'd send it out for honing and learn how to use the razor correctly before any honing attempts.

welcome to SRP

My guess CrO based paste, it is used for touch up and /or after the last stone in the honing progression to add more smoothness to the edge.



CrO can't be used to sharpen it...