Clear Coffee
The world's first Clear Coffee is exactly how it sounds -- a traditional cold brew beverage that looks like water.
Coffee's ability to stain the teeth of those who drink it regularly is one of the beverage's major downsides, and the Clear Coffee brand alleviates that problem entirely. It is made from high quality Arabica coffee beans, has the same flavor as regular cold brew coffee, and also has a standard amount of caffeine in it -- but is completely clear in appearance.
The beverage is certainly unique in what it offers, however its production process remains a mystery, with the brand simply and vaguely describing it as "produced by methods which have never been used before."