The video and the source link at
fuckyeahfluiddynamics casually suggest "not to try this at home." I would like to emphasize this point, not because of the fire risk, but because of the posibility of asphyxiation. Especially in a child, a mouthful of cornstarch poses a potential risk to the airways if it is accidentally inhaled.
btw: Deflagration (Lat: de + flagrare, "to burn down") is a term describing subsonic combustion propagating through heat transfer; hot burning material heats the next layer of cold material and ignites it. Most "fire" found in daily life, from flames to explosions, is deflagration.
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