If you’ve ever sipped a bright, tomato-driven Kenyan coffee and thought, “What in the world is going on here?” you’re not alone. For decades, the coffee world has been chasing the elusive “Kenyan note”—that sharp acidity, that black currant punch, that almost savory depth. But behind that flavor lies a story of science, selection, and a bit of serendipity: the SL28 and SL40 varieties, developed at the Scott Laboratories in Kenya.
A Bit of History
In the 1930s, the British colonial government wanted to improve coffee production in Kenya. The existing Arabica varietals struggled with disease and inconsistent yields. Enter the Scott Laboratories, named after the Scottish botanist and agronomist, Dr. James Scott. His team received the task of breeding a more resilient, higher-yielding coffee plant.
The result? SL28 and SL40. These weren’t just any new varieties; they were the product of meticulous crossbreeding and selection. SL28 came from a seedling of the “Ruiru 11” variety, while SL40 was a direct descendant of the “Kiriandongo” variety. Both were selected for their disease resistance and their flavor potential.
Flavor Profiles: Why They Matter
SL28 and SL40 are often grown together on Kenyan farms, and for good reason. They complement each other beautifully. SL28 tends to be more acidic, with notes of black currant, red apple, and a hint of citrus. SL40 brings a richer body, with flavors of chocolate, caramel, and a touch of spice.
“The magic of Kenya isn’t just in the beans — it’s in the way they’re grown, processed, and selected. SL28 and SL40 are the backbone of that magic.”
At Contour Coffee, we’ve roasted both varieties separately and together, and the results are always intriguing. The acidity of SL28 can be almost electric, while SL40 grounds it with a smooth, almost buttery mouthfeel. Together, they create a cup that’s complex, balanced, and utterly addictive.
Growing Conditions: The Kenyan Advantage
Kenya’s high altitudes, volcanic soil, and consistent rainfall create the perfect environment for these varietals. The beans are hand-picked, hand-processed, and often washed to bring out their bright, clean flavors. The result is an exceptional coffee that has defined what East African coffee means to the world.
Why It Matters to Us
At Contour Coffee, we’re always looking for beans that tell a story. SL28 and SL40 are more than just varietals; they represent the ingenuity of coffee farmers and the science behind great coffee. When you drink a Kenyan coffee from Contour, you aren’t just tasting a cup of coffee—you’re tasting history, science, and a bit of African magic.