How does the texture and color of coffee change as it's roasted?

Posted by Erin Plett on

This is how roasted coffee is transformed from green (raw) to brown (roasted). Also notice how the beans almost double in size. Top left is green coffee, bottom left is a light roast and bottom right is where dark roast would start. Because this roast was stopped at the beginning of a dark roast the surface oil will only start to show up a week or two later.