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Milk is a complex biological fluid produced by the mammary glands of mammals and is considered one of the most nutritious natural foods. The physico-chemical properties of milk refer to its physical and chemical characteristics that determine its composition, behavior during processing, and overall quality. These properties include color and appearance, density, viscosity, acidity and pH, surface tension, freezing point, boiling point, and chemical composition such as fat, protein, lactose, minerals, and water. One of the important physical properties of milk is its color and appearance. Normal milk has a slightly yellowish-white color due to the presence of fat globules and carotene pigments. The whiteness is mainly caused by the scattering of light by casein particles and fat globules. Any abnormal color, such as bluish or reddish tint, may indicate adulteration or contamination. Thus, visual observation of milk is a simple and preliminary method for _______ ________ _______ __________ _______ __________ ______ ____ ____ ________ __________ _______.
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