These lads are looking for preserved bog bodies somewhere in Norway.
Are you sure, lad?
I think I found a bog body!
This room has experienced wear and decay over time as acids corroded the walls and floorboards.
These lads are using an indicator to check for acids found in chemical weapons such as chlorine gas. The indicator beingused here is referred to as "M5 liquid vesicant detector paint".The paint is typically a brown color, but turns to red on contact with acids.
Now we wait and see if it turns red...
Salt, in terms of chemistry, is also useful, one such salt is Potassium Nitrate, an oxidizer that was crucial for operating black powder weapons, such as the field cannon shown below, which, on an unrelated note, is being moved by hand.
Acid + Base = H20 + Salt
H+NO3 (Acid) + KOH- (Base) = H20 + KNO3 (Salt)
Speaking of Potassium Nitrate, it is a salt made through neutralization, adding H+NO3, which is an acid, to KOH-, which is a base.