A mate was given what he was told was rosewood , cut and sanded slabs of it , but every time he wets it or oils it it goes black as shown, what can he use to coat it and still be able to see the grain ? any ideas
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Apply internally until you can’t see anything.
Works every time.

go to the know it alls over the valley. Used to be a road but the crack got wider.

Don’t use old diesel oil.

Use old diesel oil.

He could try a water based polyurethane, but try it on a bit of scrap first.

Does it happen on the side grain?

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