Permanent sometimes means permanent.
I'd probably try denatured alcohol first, then oxalic acid, then hydrogen peroxide, then contacting a furniture conservator.
The problem is that even if you find the right solvent you risk driving the diluted stain deeper into the pores. Always keep clean, dry rags or cotton balls handy to blot away excess
Bon chance!
Eucalyptus oil
A few suggestions. Eucalyptus oil can remove marker stains but I would use cotton buds to test it on a small patch of timber. Perhaps orange oil might also remove the stain.
I have had a great deal of success using a little Brasso on a polishing cloth to remove water marks on furniture. It might also remove ink.
But, of course!
There's nothing quite like a snootful of vodka to cure one's cotton balls. Why didn't I think of that? When in doubt, have a drink or two and sand it off! As it happens, though, I often end up with more marks than when I started.
It does make sense, as rosewood is very dense and somewhat resistant to glue bonds, that the marker might not have penetrated beyond the very surface. I assumed there had been no finish film beyond the typical oiling, but, obviously, I need to hop off this damned wagon in order to see the bigger (smaller?) picture.
You are my man of the hour, Daniel. I propose a toast in your honor!
HA! Who said the pen is mightier?
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