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The crema in a cup of ESP is actually made up of grease and foam

Published: 2026-09-29 Author: World Gafei 👁 102 views

Last updated 2026-09-29 — The crema in a cup of ESP is actually made up of grease and foam, while grease is divided into two forms. The oil is liquid and the fat is solid. The presence of grease can destroy the structure of the foam and cause crema to disappear quickly in a few minutes. Since the surfactant in coffee is dissolved in water, the surfactant of the grease surface will be pulled off the surface of the foam together with the water, causing the foam to change.

The crema in an ESP is actually oil and foam, and oil exists in two forms-oil as a liquid and fat as a solid. The presence of grease destroys the foam structure and can cause crema to disappear quickly within minutes. Because the surfactants in coffee are dissolved in water, the surfactants on the fat surface are pulled away from the foam surface with the water, making the foam weak, lose elasticity, and then quickly disappear.