Why does skimmed milk become yellow when i put some water?

Skimmed milk can appear yellow when water is added due to the dilution of its components, which affects the perception of color. The fat content in whole milk contributes to its creamy white appearance, while skimmed milk has less fat. When water is mixed in, it can alter the way light scatters through the milk, potentially revealing more of the natural pigments present, such as carotenoids, which can give a yellowish tint. Additionally, the change in viscosity and concentration may affect how light interacts with the milk, enhancing the yellow hue.