Investigators say the adulteration was nothing short of a wholesale re-engineering of milk. Researchers established that workers at Sanlu and at a number of milk-collection depots were diluting milk with water; they added melamine to dupe a test for determining crude protein content.
The investigators' findings revealed a severe case of milk contamination. Researchers discovered that employees at Sanlu and various milk collection centers were watering down milk with water and then adding melamine to fake test results for protein content, which is crucial for determining the quality and safety of the milk.