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I put mine in the microwave for 30 seconds.
The man who creates a self warming chromatic harmonica will make dozens of dollars!
Heck, I did that 20 years ago; just never built it. In fact, I have a few different designs, both powered and non-powered. When someone actually produces one with the same, or even similar design, first, I'm gunna feel just terrible, and then ask: "What took ya so long?" I'll just have the satisfaction (and even the drawings that I have around here somewhere) that I thought of it first.