My brother in law is obsessed with Batman. Yes the same brother in law I man the Batman walking stick for. Today is his birthday and we are doing dinner and cake later. I didn't know what to get him, and he loves all the wood stuff I make. So off to the computer and CNC.
It's his favorite Batman symbol with all the different Batman symbols evolved over time cut into it. The base is walnut, and a cutout of the Batman mask.
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I'll take a guess, and say that water is absorbed by the cells of the wood, because that is how the wood fibers work in the living tree. Alcohol and oil aren't naturally absorbed, and only fill the inter-cellular space, therefore don't swell the fibers and cause 'raised grain'.
That is all conjecture on my part, I really have no idea.