Porters of the late 1700’s were quite strong compared to today’s standards, easily surpassing 7% alcohol by volume. Some brewers made a stronger, more robust version to be shipped across the North Sea, dubbed a Baltic Porter. In general, the style’s dark brown color covered up cloudiness and the smoky, roasted brown malts and bitter tastes masked brewing imperfections. The addition of stale ale also lent a pleasant acidic flavour to the style, which made it quite popular. These features were quite important as breweries moved away from pub brewing and began opening up breweries that could ship beer across the world.