Light roast: The light roast is acquired through roasting beans at temperatures that are relatively low, such as 356 to 400 degrees Fahrenheit. The beans will expand and crack, which releases extra taste. The beans will display a light color with no surface oil, high acidity, and a great deal of caffeine.
Medium roast: The ideal temperature for a medium roast is 410 to 427 degrees Fahrenheit. This will give coffee beans a moderate brown color with an oily surface, balanced acidity, aroma, and flavor but less caffeine.
Medium-dark roast: This roast ranges from 437 to 450 degrees Fahrenheit. The beans will display dark coloration with a body that is spicy and heavy with a noticeable aroma.
Dark roast: This roast transpires after the second crack at temperatures between 465 to 480 degrees Fahrenheit. The beans will display a dark color resembling chocolate with oil that can be seen on the surface. They have a bitter taste and the caffeine levels are much lower.