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It makes it easier and quicker.

But even a yellow coticule can be used to get rid of deep nicks.
http://straightrazorpalace.com/showthread.php?t=9432

Actually, for maintaining a razor in good condition, or restoring an edge that is just dull, a norton 4/8 is all you need.
Or you can use just a coticule.
either one will do the job.

having a...