Coffee Characteristics and Roast ProfilesRoasting coffee transforms the chemical and physical properties of green coffee beans into roasted coffee products.

The roasting process is what produces the characteristic flavor of coffee by causing the green coffee beans to expand and to change in color, taste, smell, and density. Different people have different preference roasting level. It takes years of experience and a lot of trials and errors to improve an individual roasting skills to be considered as an artisan in coffee industry.

The chart below explains the changes in color, aroma, flavor, and bean size based on the degree of roast and temperature: