Buttermilk is primarily due to lactic acid produced by lactic acid bacteria while fermenting lactose, the primary sugar in milk. As the bacteria produce lactic acid, the pH of the milk decreases and casein, the primary milk protein, precipitates, causing the curdling or clabbering of milk. This process makes buttermilk thicker than plain milk. While both traditional and cultured buttermilk contain lactic acid, traditional buttermilk tends to be less viscous, whereas cultured buttermilk is more viscous. Buttermilk can be drunk straight, and it can also be used in cooking. Soda bread is a bread in which the acid in buttermilk reacts
A Matter of Loaf and Death began in January 2008; creator Nick Park commented that the production period for the short was significantly quicker than that of the feature-length films "Chicken Run" and "", which each took five years to complete. "A Matter of Loaf and Death" was the first Aardman film to be made using the software Stop Motion Pro. Five models were created for Gromit alone, with scenes being shot simultaneously on thirteen sets. Commenting on the fact that the short would be made directly for a British audience, Nick Park said: "I don't feel like I'm making a film for a kid in