Half a croissant, on a plate, with a sign in front of it saying '50c'
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vinegarNsoda fire extinguisher

simple and cheap. break this in emergency and throw in fire.
 
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Baking soda powder and vinegar separated in a small device. easily crush it and throw into the fire.
pashute, Dec 25 2019

Anti-fire bomb http://www.bbc.co.u...KMBwbSM2Hxf2EXPCBRA
One example amomgst dozens; not notably effective. Various fillings were tried. [8th of 7, Dec 25 2019]

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       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.
8th of 7, Dec 25 2019
  
      
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