Decades from now after exhaustive scientific research, it will be revealed that the only substance on the surface of a bass that can possibly affect tone is the nasty finger crud that builds up on fretboards. Everyone will be disgusted but also relieved to see the long and endless debate over nitro vs poly finishes finally end.
However, far from settling the issue, it will simply ignite an even more pointless debate on which body chemistry creates the best tone. The ensuing finger crud pH level tone debate will rage for another hundred years and be explored in such depth that everyone will get completely grossed out and never want to touch a fretboard with their bare hands again.