regardless of the correctness of the obituary, a very experienced chemist did not realise that the acetone vapour in a laboratory that he was working in at the time, had built up enough to explode - a casual user in a shed may easily fall into that trap. Outdoors is a good idea Stefan.
fwiw, acetone powders are as Marty described and are available commercially
https://www.sigmaaldrich.com/life-sc...ePage=16192432