What are Roast Curves?
Roast curves are the graphical representations of temperature changes during the coffee roasting process, typically plotted as bean temperature over time. Roasters use these curves to control flavour development, consistency, and repeatability in specialty coffee roasting.
Why roast curves matter
Flavour development: Adjusting the roast curve influences acidity, sweetness, and body.
Consistency: Curves allow roasters to replicate successful roasts across batches.
Transparency and learning: Documented roast curves help roasters share knowledge and refine their craft.
Specialty vs. Commercial Coffee and Roast Curves
In specialty coffee, roast curves are carefully monitored and adjusted to bring out the best in each lot, often using software and precise profiling. In commercial roasting, the focus is usually on efficiency and scale rather than precision, so curves may be less refined.
Where Nordic Approach fits in
At Nordic Approach, we continuously develop our roasts and check roast curves.
FAQ about Roast Curves
Q1: What’s the difference between bean temperature and environmental temperature in a curve?
A1: Bean temperature tracks the coffee itself, while environmental temperature measures the heat inside the roaster chamber. Both are important.
Q2: Do all roasters need to track curves?
A2: For specialty coffee, yes they should, consistent roast curves are essential for quality control.
Q3: How do roast curves affect flavour?
A3: A faster curve may highlight acidity, while a slower curve often develops sweetness and body.