professorpaul wrote:
Just a VERY dark mahogony stain, if I recall correctly. I had a piano
bench that I refinised some years ago. Had a terrible time getting it
dark enough. Must have put on three or four doses of stain, and it
still wasn't quite right.

According to Bob Flexnor, the first application of stain, if done
right,
will 'saturate' (my words, not his) the pores of the wood so that
subsequent
applications will have no further effect.

Dyes are different.

Regarding OP, can he scrape off a bit of the original finish to
verify that the color is in the wood and not in the finish (toning).
It may be a black laquer.

Maybe black shoe polish would work. Or as tohers have suggested,
spray paint.

Back when wood and metal were the only common materials
for furniture, the only alternatives to a natural wood grain were
metal or a finish that abscured the wood grain. Nowadays with
plywoods, plastics, composites and so on it makes no sense
at all to make something out of wood and obscure the grain.

of course OP was not making something new, he was matching
something old.

--

FF