Discover how data-driven coffee roasting improves consistency, quality control, and decision-making. This article explains how roast color, moisture, density, and water activity data help roasters evaluate results more clearly and build a more repeatable roasting workflow.
Learn the difference between coffee bean color measurement and ground coffee color measurement, and why they should not be treated as interchangeable data. This article explains how each method reflects roast development differently and how roasters can use both for more consistent roast evaluation.
Roasting never happens inside a theoretical vacuum. It happens in a room with a certain ambient temperature, a certain humidity level, changing airflow behavior, and beans that arrive at the machine carrying their own starting temperature. When those surrounding conditions shift, roast behavior can shift with them. The machine may be the same, the profile may be the same, and...
Abstract In the coffee roasting process, the Yellow Point is an extremely important stage, typically occurring at 150–160 °C. At this moment, the color of the coffee beans changes from green to light yellow, the grassy notes noticeably diminish, and subtle cereal-like aromas begin to emerge. Traditionally, roasters relied mainly on visual observation of color changes and olfactory perception of...
Abstract The TDS meter has become an essential tool in coffee extraction research and quality control, as it quantifies the proportion of total dissolved solids (TDS) in brewed coffee and provides an objective basis for brewing evaluation. Within the widely recognized Golden Cup Theory, TDS together with extraction yield (EY) serve as the two core indicators for determining whether coffee...
Abstract In coffee roasting, color change has always been a key indicator for determining the roast level. Traditionally, roasters rely on visual observation of the beans’ transformation—from the yellow-green of raw beans to light brown, dark brown, and even near black—combined with crack sounds and aroma for a subjective assessment. However, this method has significant limitations: Strong influence of lighting:...
