Karl's Ninety 90 Shilling Extract Beer Recipe KitKarl Engebretson (whom many of you know through our catalog covers and ads in BYO and Zymurgy) is a certified Giant Norwegian with a taste for similarly proportioned beers. We have found he has a way with Scottish ales, and this is his 90 . Somewhere in between an 80 and a Wee Heavy, ninety also refers to the length (in minutes) of the boil. This additional time spent on heat intensifies the beer color and adds depth and breadth to its malt profile.