What is coffee crema?

    Coffee crema is mainly composed of carbon dioxide and the insoluble fat of coffee powder. Roasted coffee beans contain carbon dioxide and other gases inside. When coffee machine extracts coffee, the extractor "squeeze" the coffee powder. Because of the high pressure, water is supersaturated for the carbon dioxide in coffee powder. There is no way for the carbon dioxide to be released, and is directly incorporated into the coffee liquid.

    In this process, the fat in the coffee will be emulsified, and these fats will wrap carbon dioxide. Since it is lighter than water, all will gradually layer, and the golden oil will appear on the surface, which is very beautiful. This is coffee crema.

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