Types of coffee roasting: how roasting influences flavor

What is coffee roasting?

Coffee roasting is the process by which green coffee beans are heated to high temperatures to develop their characteristic aromas, flavors, and color. During roasting, chemical reactions occur that transform the sugars and compounds in the bean, creating the flavor profiles we perceive in the cup.

The roasting time and temperature determine the final coffee profile, which is generally classified as light, medium, or dark roast .

Roasting is one of the most important stages in the transformation of coffee.

During roasting, the green coffee beans are heated to develop the aromas, flavors, and colors characteristic of the coffee we know.

Depending on the roasting level, coffee can offer very different flavor profiles.

This guide is part of our Colombian Coffee Guide , where we explore the origin, roasting, and best ways to enjoy Colombian coffee.

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What happens during roasting

When coffee is roasted, the beans undergo significant physical and chemical changes.

During the process:

• the grain expands

• aromatic compounds change

• New flavors appear

Controlling the roasting process is key to highlighting the characteristics of the coffee's origin.

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Light Roast

Light roasting is common in the world of specialty coffee because it allows for a better appreciation of the coffee's origin and preserves many of the bean's original flavors. These coffees typically exhibit higher acidity and fruity or floral notes that clearly reflect the coffee's origin.

Characteristics of a light roast:

• higher acidity

• more complex flavors

• fruity or floral notes

• light brown color

• dry surface (no oils)

This type of roasting particularly highlights single-origin coffees, such as Colombian coffees grown at high altitudes. It is often used for brewing methods like V60, Chemex, or filter coffee , where the natural characteristics of the bean can be best appreciated.

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Medium Roast

A medium roast offers a balance between acidity, sweetness, and body. During this roasting level, the beans develop more rounded flavors without completely losing their original characteristics.

Characteristics of medium roasting:

• balance between acidity and body

• pronounced sweetness

• notes of chocolate and caramel

• medium brown color

This type of roast is one of the most popular because it produces a balanced cup.

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Dark Roast

Dark roasting involves a longer roasting time, resulting in darker beans and more intense flavors. As the roast level increases, the natural origin notes may diminish, and more toasted or chocolatey flavors may emerge.

Characteristics of dark roasting:

• lower acidity

• more robust flavors

• notes of intense or roasted cocoa

• dark brown color

• oily surface

At this roast level, the flavor from the roasting process typically dominates over the origin characteristics. Dark roast coffees are frequently used for espresso , as their intense profile works well with low-pressure extraction methods.

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Comparison of roasting levels

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Which roast to choose

The choice of roast level depends on both personal taste and the preparation method.

For example:

Light roast

Ideal for:

• V60

• Chemex

• Aeropress

Medium roast

Ideal for:

• French press

• percolator

Dark roast

Ideal for:

• espresso

• moka

  Toast	Flavor profile	Acidity	Common use
  Clear	Fruity and floral	High	Filtered coffee
  Half	Balanced	Average	Versatile
  Dark	Intense and toasted	Low	Espresso

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Roasting in specialty coffee

In specialty coffee, the goal of roasting is to highlight the origin of the coffee .

This means that the roaster seeks to develop the natural aromas of the bean without hiding its characteristics.

Specialty Colombian coffees, for example, are usually roasted in a way that maintains their fruity notes, natural sweetness, and balanced acidity.

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Single origin and roast coffee

In the world of specialty coffee, roasting is used to highlight the character of the origin .

High-quality Colombian coffees are usually roasted in a way that preserves their fruity notes and natural sweetness.

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Colombian coffee in AlmAmericas

At AlmAmericas™ we believe that roasting should respect the work done by coffee growers.

Our goal is to offer coffees that express the character of their origin and the richness of Colombia's coffee-growing regions.

Frequently asked questions about coffee roasting

What is the best coffee roast?

There is no single perfect roast. Each level offers different characteristics.

Does dark roast have more caffeine?

Not necessarily. The caffeine level changes very little between roasts.

Why do some grains contain oil?

The oils appear in darker roasts due to the prolonged heat of the process.