Steaming almost 24 x 7 the 'dark grains' plant at Rothes on Speyside used to transform by-products from distilling ~ draff (spent grain from mash-tuns) & pot ale (residue from stills) into cattle-feed pellets but now into biofuel. Spent Grain, Cattle Feed, Steaming, Transformations, The Darkest, Ale, Grains, Natural Landmarks