A common sodium chloride compound. Granular in structure.
The recorded use of salt in day-to-day life dates back to China at least 8000 years ago. Salt's first reported use as a weapon against monsters occurred in 1782, when Scotland Yard's Strange and Unusual Cases Squad (with the help of Troop members from Brighton, England) used it to take down the Giant Eyeball Beastie of Brighton.
An essential for every well-stocked Troop laboratory, salt is a quick, easy, low-budget way to suck the water out of a moisture-based creature, such as the Gelatinous Cube. In addition, it can temporarily blind creatures with large eyes, and provide the traction necessary to grip ice monsters. Salt is also commonly used for adding flavor to bland or poorly-cooked food.