Sold this guitar on Nov 19, 2019 - TAN LINES CHANGED in the interim
OP here. Just a heads-up, long after the fact.
Two days ago, Friday, I sold the guitar that is the basis of this experiment. I hadn't looked at it much in the interim; it spent most days in its case.
I'm pretty careful to keep my instruments humidified, but this one may have gotten a bit dry as I moved from eastern Nebraska to Utah, which is arid/semi-arid. I mention humidity only because a lack thereof might be a factor in what happened.
During the experiment I brought the much-lighter wood tone under-pick-guard area to almost exactly the same golden tone as the rest of the spruce top. Years later (in the past few days) careful inspection under excellent lighting shows the under-pick-guard area to have shifted to a slightly darker/deeper tone than the rest of the spruce top.
Is it due to the wood, or the poly spray-on varnish? Did a possible short-term lack of humidity affect either the wood color or the varnish color? I don't know, but I thought I should present the information for the benefit of anyone trying this.
Today is December 22, so Merry Christmas!
Tom
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