This roast has a dark brown color like dark chocolate and often has an oily surface. These coffee beans are left the longest in roasting in higher temperatures than the others. The beans lose more moisture, become less dense, and will have a bitter/smoky taste.
Caffeine is decreased from light roast to dark roast, so it will have the least amount of caffeine if measured by scoops. As coffee roasts become darker, the original flavor is lost but take more flavor from the roasting process, similar to roasting nuts (3).
Some purists prefer what’s called a French roast, which is darker than dark roast and just a hair before being considered burnt.
If you want a more full-bodied coffee with a bold flavor, dark roast is the perfect choice!