Sometime before or after the neck heel of This Old Guitar was damaged by a previous owner, her pickup and preamp were removed, and her busted neck and body were used as wall hangings at a musical instrument store repair desk. Although I'm all for displaying non-working musical instruments for art's sake, there was an extra hole in the rear of the bowl that needed to be repaired. Celluloid binding strip, as well as the plastic Jay Turser used to make their bowls, can be melted down easily with pure acetone.
I masked off the area to help contain the reaction at the outside of the bowl, and poured some acetone into the bottle cap.
The OSHA guideline for acetone describes its appearance and odor as a colorless liquid with a fragrant, mintlike odor. It's the main ingredient in nail polish remover, and full-strength acetone doesn't smell at all like incense or peppermint to me. The effect of inhaling too much acetone can be a light-headed "psychedelic experience" at best, and a "bad trip" at worst, including nauesea and depressed respiration. If you've ever spent a long time in a beauty parlor or nail salon with poor ventilation, some of these symptoms might sound familiar.
The exhaust fan in the This Old Guitar workshop is on the weak side, so I was careful to work up wind of the acetone and worked quickly. A couple of narrow pieces of black binding sandwiched together filled the hole, to be trimmed down from the outside with a knife and sand paper.
The hole was through the label on the inside of the bowl. This side of the repair to the bowl will also get trimmed, but I'll leave the label as-is and let the repair be purely functional.