MARTYN F. CHILLMAID / SCIENCE PHOTO LIBRARY MARTYN F. CHILLMAID / SCIENCE PHOTO LIBRARY
Curdled milk. Bottle containing milk that has curdled (spoiled). The milk has separated out into its constituent components of liquid, known as whey, and solids (mainly fat), known as curds. Curdling is caused by micro-organisms present in the milk or the surrounding environment.
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