ArticleHomebrew Science Experiments A lone figure stands above the steaming kettle. A sample of the malty liquid is carefully drawn off, cooled, and then poured into a graduated cylinder. He drops a glass hydrometer slowlyAlready a member? Log InWritten by Alex FodorIssue: June 1997You'll Also Like Article MEMBERS ONLY Enzymes Ex Machina: Explore the world of exogenous enzymes For a long time the only enzyme most brewers would ever think about adding was some amylase enzymes . . . boy have times changed. Learn about the rapidly expanding world of exogenous enzymes. Article MEMBERS ONLY It's Complicated: Understanding oxygen in brewing Oxidation has negative connotations in all areas of brewing except one. Learn how oxygen finds its way into our beer and some of the keys to controlling it.