I will try flour outside on a wood fire and see what it does. I will post the results.
Flour can E X P L O D E.
Please note the video in post #14, which mimics what happens in grain elevator explosions - a Farm Girl like you should know about those. They are set off by just a spark, or an overheated bearing.
Not to disrespect your mom, but there are a lot of old time / folk remedies / common wisdom things that, while well intentioned, were just plain wrong.
For example, (most of the people on this site) now know that the world is not flat and that the Earth revolves around the Sun. Sometimes, people get lucky when doing something they shouldn't, or get away with something, but it is not the thing to encourage others to do.
Baking soda is different, and can work on cooking and grease fires, etc.
Philbert