How to use the golden cup criterion to judge whether the coffee is too good? Relationship between extraction rate and concentration of Coffee

Coffee extraction rate formula most standard time calculation range

Espresso single 30 ml, double 60 ml extraction volume almost no one will change, except a few Italians will use a single coffee powder volume but only extract 15 ml coffee solution

American coffee (Americano). Simply put, ESPRESSO heats water. In general, one portion of ESPRESSO is used for small glasses, two portions for medium glasses and three portions for large glasses. It should be noted that many filter coffee shops will also have American style, because American style is originally made with filter method. But at an Italian coffee shop you'll be lucky to get a richer taste of Americana coffee. The Americana flavor of water heated with ESPRESSO is completely different from that of filtered coffee! Point: Starbucks 'American coffee is ESPRESSO heated water. Medium TALL 12oz 360ml

Measuring coffee quality dates back to the 1950s. E. E. Lockhart, then a professor of chemistry at MIT, conducted a series of surveys to study American taste preferences. He basically surveyed a lot of coffee drinkers and asked them what they liked.

Lockhart published his research with a "coffee brewing control chart," a graphic representation of what Americans thought was the best coffee at the time.

Years later, SCAA confirmed that American tastes had changed little. The perfect coffee, at least for Americans, is coffee with an extraction rate of 18 to 22 percent and a total dissolved solids content of 1.15 to 1.35 percent after brewing.