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Dressing essentials. Salad dressing is an emulsion: a mixture of two unblendable liquids, in which one liquid (in this case, the vinegar) forms tiny droplets within the other.When the vinegar is suspended in the oil, it forms a thick, glossy mixture.l Vinaigrette-type dressings are unstable â the oil and vinegar will separate again if they are left to stand around for too long. A good dressing should complement the salad, and not overpower it.hen the vinegar is suspended in the oil, it forms a thick, glossy mixture. l Vinaigrette-type dressings are unstable â the oil and vinegar will separate again if they are left to stand around for too long. A good dressing should complement the salad, and not overpower it.
Examples of Emulsions. 1  Oil and water mixtures are emulsions when shaken together. The oil will form drops and disperse throughout the water. 2  Egg yolk is an emulsion containing the emulsifying agent lecithin. 3  Crema on espresso is an emulsion consisting of water and coffee oil. 4  Butter is an emulsion of water in fat.