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Information about Flour fire ball

As well as the flour bomb, use a long piece of very wide bore glass tubing
with a fine piece of fine copper mesh shaped and placed in one end. Place a
teaspoon of flour down the tube to rest on the mesh. Aim into a blue bunsen
flame and blow down tube to blow flour out of mesh. Should result in a large fireball!

Safety Precautions

Sound fairly dangerous. Would the original author or someone who has done
this demo add some safety precautions please.

Note

Flour mills have been destroyed when a flour-air mixture ignited
explosively. While flour is difficult to burn on its own, when it is turned
into a dust cloud in the presence of a flame it will combust rapidly due to
the large reactive surface area that is exposed. Similar reactions can occur
with a number of other fine combustible powders. e.g. sawdust, coal dust,
grain dust (in grain elevators) and some metal powders.

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