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If you plane a rough surface it should come out smooth.

I do not know how deep the "grey" goes so this may or may not be removed. If the grey is due to oxidation/weather it will likely be removed. If it is the natural colour of the heart or sap wood, it will not be removed - unless you plane off the entire area.

In many species sap wood is lighter than heart wood. Sometimes sap wood is cream/white compared to heart wood e.g. walnut.
 
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