Removing unwanted substances from liquids and gasses by filtering them through a solid material is an ancient technique. The process of adsorption was described as early as 1550 BC in an ancient Egyptian papyrus and later by Hippocrates and Pliny the Elder. It was mainly used for medicinal purposes.
At the beginning of the 19th century, the ability of bone char to take the color out of liquids was discovered by the sugar industry in England. At the beginning of the 20th century, methods of activating carbon with chemicals or by use of steam were discovered. During the First World War, steam activated coconut char was developed in the United States for gas masks. Today, many different materials - not only carbon - can be processed to develop selective adsorption of a wide variety of substances, and these techniques are used extensively in many industrial processes and the manufacture of foods, beverages, and medicines.
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Discover How To Become Your Own Brew Master, With Brew Your Own Beer. It takes more than a recipe to make a great beer. Just using the right ingredients doesn't mean your beer will taste like it was meant to. Most of the time it’s the way a beer is made and served that makes it either an exceptional beer or one that gets dumped into the nearest flower pot.