The test that indicates the amount of extraneous material in milk but does not show dissolved material is called what?

The test that indicates the amount of extraneous material in milk, while not measuring dissolved material, is known as the sediment test. This method is primarily used to detect particulate matter, such as dirt, feed particles, or other impurities that can settle at the bottom of a container. Sediment in milk often results from improper handling or contamination during the production process, and assessing its amount helps determine the quality and safety of the milk.

Unlike microscopic count, which evaluates the presence of microorganisms (bacteria, yeast, or molds) and can indicate the microbial quality of milk, the sediment test focuses solely on physical impurities. Thermoduric testing measures the ability of certain bacteria to survive heat treatment, which doesn't pertain to the presence of physical contaminants. The appearance of the milk might provide a visual indication of extraneous materials but doesn’t quantitatively assess the sediment found in the sample. Hence, the sediment test is the most relevant for identifying non-dissolved impurities in milk.