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Baking soda powder and vinegar separated in a small device.
it and throw into the fire.
One example amomgst dozens; not notably effective. Various fillings were tried. [8th of 7, Dec 25 2019]
||Very Baked & WKTE, over a century ago. Identical devices, glass spheres, were sold during WW1 as "Anti-fire grenades" for protection against Zeppelin-dropped incendiaries.
||[suggested-for-deletion], not an innovation.