Emulsions usually have milky appearance.

• A. True
• B. False
• C. Not sure
• D. Sometimes

Answer: (A)

Emulsions are mixtures in which a liquid is dispersed as tiny droplets within another immiscible liquid. The milky appearance comes from light scattering by all those numerous droplets; when many droplets are present and large enough to scatter visible light, the mixture looks opaque and white, as seen in common examples like milk or mayonnaise. Emulsifiers—think of substances in foods like egg yolk or lecithin—form a stabilizing film around each droplet, helping keep them dispersed and maintaining that opaque look. While this milky look is typical, some emulsions can be translucent if the droplets are extremely small (nanoemulsions) or the dispersed phase is at a low concentration. But overall, the usual visual cue for an emulsion is a milky, opaque appearance.