What observations matter most during a colloid mill practical to assess emulsion quality?

During a colloid mill practical, the most important observations include the visual homogeneity of the emulsion, absence of visible oil droplets or graininess, viscosity consistency, and stability upon standing or centrifugation testing. Recording rotor speed, gap setting, and processing time alongside these observations helps students connect operating parameters directly to the quality of the emulsion produced in the colloid mill practical.