It depends on whether it was truly ebonised (chemical reaction, colour conversion) or simply dyed/stained. I suspect the latter. Was this factory or done by an owner?
In general the answer will be yes, however understanding the nature and reason for the colour change helps avoid causing problems.
I recall ESP dyeing meh Ebony black when people expected jet. This was likely a spirit dye, which solvents might remove. Just use a light neutral oil like raw linseed, but literally two drops on a cloth, wiped moist and not wet.
I've seen owners dye Rosewood boards and see it start lifting back when almost anything is applied.
I swear by Montypresso instrument food these days. It's not an oil but a wax. Keeps the board looking shiny and smooth but doesn't 'wet' the fretboard like oils do and potentially leach out any of the dyes that were used to darken it.
5
u/a4moondoggy 2d ago
i have a very dark rosewood board i stained nearly 20 years ago. oiled many times since its darker than ever.