Something in the water: The dark and deadly secret behind Saigon cheap coffee

A market of industrial chemicals in Ho Chi Minh City is having a new product on sale. And it has quickly become a bestseller. 
 
The black liquid, coming in big plastic cans, works magic. Just add a few drops into water and you can turn it into coffee — or at least something that tastes very close to coffee. 
 
The label does not even try to hide what the chemical substance is for: “super profits” and “super convenience.”