Prosecuting, Michael Masson told how police discovered 800 kilograms of barium nitrate at a farm at Kirton Lindsey, where the landowner had no idea of what was being stored on his property.

Two dry solids --- barium hydroxide and ammonium nitrate --- are mixed to produce an endothermic reaction. The temperature of the mixture drops approximately 45oC and is cold enough to freeze the ...

Endothermic reactions include solid citric acid and sodium hydrogencarbonate, and dissolving ammonium nitrate in water ... which is the reaction of solid barium hydroxide and solid ammonium ...