The product that was to become Marmite was invented during the late 19th century when German scientist Justus von Liebig discovered that brewer's yeast could be concentrated, bottled and eaten. During 1902, the Marmite Food Extract Company was formed in Burton upon Trent, Staffordshire, England with Marmite as its main product and Burton as the site of the first factory. The by-product yeast needed for the paste was supplied by Bass Brewery. By 1907, the product had become successful enough to warrant construction of a second factory at Camberwell Green in London.