"Samuel Allsopp did something hitherto unknown, he upped the alcohol and hop content which both act as preservatives. "It really dialled it up strongly, and it was a really bitter beer. At the time it wouldn't have been drinkable straight out of the brewery, but after the six months at sea going down the Cape of Good Hope, it mellowed and arrived in India in really good condition." https://www.bbc.com/news/articles/cwe8reg5l9r1o