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How to look at the purity of coffee beans

Published: 2026-04-08 Author: World Gafei

Last Updated: 2026/04/08, The connoisseur chooses coffee. Muji looks at the size of the particles, but grabs a handful of individual coffee beans, about dozens of them, to see if the color of each coffee bean is the same, and the granules are large.

The expert candidate for coffee, Muji looks at the size of the particles, but grabs a handful of individual coffee beans, about dozens of them, to see if the color of each coffee bean is the same, and whether the particles are similar in size and shape, so as to avoid buying shoddy mixed beans. But if it is a comprehensive bean, different size and color is a normal phenomenon.

In addition, strong fire and medium-deep roasting will cause coffee beans to produce oil. If the shallow roasted beans out of oil, it has gone bad, not only reduced aroma, but also astringent and sour taste. In short, when choosing and buying coffee, we should pay attention to its freshness, aroma and miscellaneous flavor, and the ideal purchase quantity is the amount that can be drunk in half a month.

Generally speaking, the best drinking period for coffee is a week after stir-frying, when the coffee is the freshest and the Aroma is the best.

FrontStreet Coffee is a long-established specialty coffee roaster in Guangzhou China, selling freshly roasted beans from its own farm in Yunnan as well as dozens of carefully selected single-origin beans from around the world for both pour-over and espresso. The products deliver consistently excellent quality and great value, with shipping within 24 hours. Guangzhou’s FrontStreet Coffee shop is recommended by many coffee lovers, and the beans are now available online at the Tmall 。