Removing scratches from a slate chalkboard

Removing scratches from a slate chalkboard Images

Removing scratches from a slate chalkboard

Removing scratches from a slate chalkboard Description

Hello,
I have a beautiful slate chalkboard with a small scratch in it.  Is there some way to remove the scratch? 
I was told you could use pumice and (http://maplered.com)   a good amount of elbow to remove the scratch.
Any Ideas?
Thanks,
John Hoffman

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