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Crazing will allow moisture to get to the wood, darkening it in the same pattern as the craze, but not evenly.

I once lost a job at a tile shop for explaining this very thing to the home owner. I...

Crazing can be a desired finish. I actually kinda like it, but I know what you're going for. You might start thinking about a way
to create a temperature controlled environment.

It's called crazing. What did you finish it with?

Beautiful brush by the way...