ArticleYeast Problems, Fermentation Temperature & Oxidation: Mr. Wizard Q I’m an extract brewer (that also steeps) and I recently noticed a bunch of white spots on top of my brew (which was a wheat recipe) after I transferred it toAlready a member? Log InWritten by Ashton LewisIssue: September 2012You'll Also Like Article MEMBERS ONLY Fine-Tuning Bitterness, Reusing Yeast, Dry Hops in a Carboy, and a Racking Question A reader wants to know his options for adjusting a beer’s bitterness post-fermentation. Also, multi-generational yeast, dry hopping in a narrow neck carboy, and early racking dynamics. Article MEMBERS ONLY Measuring Mash pH, Wort Aeration, and Beer In A Bag All-grain brewers know it takes a few minutes of mixing to get the mash temperature to stabilize. But how about mash pH? The Wizard also offers advice on wort aeration temperature and cask ale-style beer in a bag.