Sorry Jeff, we have diverted your topic... But since we are on that tangent... I agree on not liking varnishes, I once got into using CA glue as a finish on pens, they were very shiny and no matter how long the essay you would not put a permanent finger print on it, and they actually sold well too, but I didn't like it and stopped making pens completely because they just were not tactile.
One of my favorite pieces of wood is the banister in Temple Meads, Bristol, railway station. It was probably oiled once with boiled linseed or something similar, and I bet it was perfectly straight 150 years ago. Now it is oiled by millions of greasy hands, softer areas have worn into gentle indented curves, but I am a silly sod who strokes logs!
Anyway back to the chemical burns on African Blackwood Jeff if you have some off-cuts to play with try washing in acetone then give both the first 2 suggestions a go, and also maybe the Teak reviving oil with wax on top it's what pleases you that matters. and far better to try things out on a piece of flat wood that you have not spent hours on.