Why words shake well before using indicate that juice is a suspension?

The phrase "shake well before using" indicates that juice is a suspension because it contains solid particles, such as pulp or fruit fibers, that can settle at the bottom over time. Shaking the juice redistributes these particles throughout the liquid, ensuring a consistent texture and flavor. If the juice were a true solution, the particles would remain evenly distributed without the need for shaking. Thus, the instruction highlights the non-homogeneous nature of the mixture.