I was more interested in what approved oils we could use on them for personalizing purposes/if it would affect the taste over time.
I don't see how applying oil or any other treatment would affect the taste. It could affect the smell, of course.
I haven't done anything to Jessica although I have contemplated it. Like Johnny above, she's taken on a bit of a patina from all the handling. I remain confident that Jessica is still the Zion that has been used the most.