Brown ale breweries, such as Whitbread, introduced a second weaker and cheaper brown ale that was sometimes just a sweetened version of dark Mild. These beers had an original gravity of around 1.037. After World War II, most breweries stopped producing these stronger brown ales, with the exception of some breweries in the northeast of England. The majority had an OG in the range 1.030–1.035, or around 3% ABV, much like Manns Brown Ale today. North American brown ales trace their heritage to American home brewing adaptations of certain northern English beers, and the English influence on American Colonial Ales. English brown
Old ale secondary fermentation with brettanomyces yeast which was present either in the pitching yeast or in the wooden equipment. Because of the time required for the aging process, some investors would buy mild ale from brewers, age it into old ale, and sell it at the higher price. Eventually, brewers began to keep some beer behind at the brewery, age it themselves and sell it to the pubs. In some cases old ale was a blend of young and old. The "stock ale" was the brewery's very aged ale and was used to inject an "old" quality, and perhaps acidity to