Supervise beans and watch the color change to the color you want it to be. You will hear the beans begin to snap, this is known as the “first crack” and after that will start to snap again, which is called “second crack”. For the beans to roast right, you can stop the second furnace immediately when it begins to crack. If you want to roast beans harder,you can leave the beans in the oven longer. You will notice that your seeds will get a shiny appearance and the oven starts to smoke out.
Once the beans are roasted as you wanted, put them in the pan to cool in a single layer. If you want, you can easy to mix beans with water spray. Once they have been roasted properly, put the beans in an airtight container. Roasting your coffee beans is not a complicated process once you have bit of practice. You will enjoy your own roasted coffee blends in the shortest time.