What does the term "clean cup" refer to in coffee cupping?

The term "clean cup" in coffee cupping specifically refers to the quality of the coffee being free of defects and foreign flavors. This means that when taste testers assess the coffee, it should present a pure and clear representation of its inherent flavor characteristics without any off-tastes that could indicate defects such as over-fermentation, bad storage, or other quality issues. A clean cup is essential for accurately evaluating the coffee's flavor profile, as imperfections can obscure the true taste and aroma. This not only helps in distinguishing high-quality coffees but also is critical for producers looking to assess and improve their coffee. A clean cup allows the nuances of the coffee to shine through, providing a foundation for identifying balance and depth in the flavors.