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+1 on the above with a minor addition.

The addition is that grit on canvas or leather is held
"softly" when compared to a hone. Eventually the bulk of
the individual grain gets buried deep in...

Is this your only strop?
If it is your only strop, one side plain and the other side can be red or green...
Start with the finer abrasive first. You can switch to the
coarser if needed but...