How Chemical Foam extinguishers worked

This film shows how Chemical Foam extinguisher, which were made in the UK between the 1920's and 1970's worked, using a combination of archive footage and a 60+ year old preserved extinguisher's contents.
NOTE - Made using basic smart phone and editing technology, not intended as a polished professional product!

The whole FPA video the clip is from is also on this channel and is uploaded with their consent.

[angelounabia]

Is the aluminum sulphate in liquid or solid form? Im confused, i need help, for my research, please replyyy

[DGShackleford]

Very cool, especially given the age of those solutions. What's the smell like on that stuff? Our department switched back to protein foam due to our proximity to waterways. The odor is... something else.

[yousafgee]

it is the sort of soda acid fire extinguisher ?