Irn-Bru is a Scottish carbonated soft drink that is often described as "Scotlands other national drink" after whisky. It is produced by A.G. Barr of Glasgow and has been the top-selling soft drink in Scotland for over a century, competing directly with global brands such as Coca-Cola. Irn-Bru is known for its bright orange color and unique flavor, which is sweet and tangy and quite unplaceable. The exact recipe has never been fully released to the public, but it is known to include quinine and caffeine. Some people describe the flavor as tasting like rust and battery acid, while others say it tastes like liquid bubble gum. The drinks marketing has played up the idea that it is made from girders, but this is just a joke.