Unlike liquid solutions, very few gases have a tint to them - and those that do are poisonous. Chlorine’s pretty hue of yellow belies its stark incompatibility with all living organisms. Even in very dilute form it is known as that nasty pool air that stings your lungs and turns your eyes bloodshot. It is, along with white phosphorus, the only element that has been weaponized just for its innate toxicity - and its effects so horrid that adherents to the Geneva Protocols have banned their wartime use.

This little cube here contains the deadly cargo in its purest form possible but… it’s a paper tiger. Like a thumbnail-sized kraken or Freddy Krueger, it’s more cute than dangerous given its small size. If it were to break you will probably notice the smell but if your eyes well up with tears it will be because it’s so costly to replace.