The Beer Act 1816 tightened the rules around what could legally be used in British beer, effectively forcing brewers back towards malt and hops. It followed wartime taxation and anxiety about adulteration. For porter brewers, the rule created a practical problem: how to colour dark beer without illegal substitutes.

The Beer Act's regulation of brewing ingredients in 1816 belonged to a reforming world that influenced Romantic and early Victorian writing about the poor and state power. This context helps explain why beer in poems could signify not just pleasure, but also law, taxation, class, and societal suspicion.