Skunky is a defect term related to improper roasting; tipping or scorching of coffee. It relates to a lack of sweetness, a presence of bitterness, and a particular skunk-like animal character. SL-28 Scot Labs selection 28 Kenya cultivar, a preferred type with Bourbon and Mokka heritage. It supposedly is selected from Tanganyika DR cultivar, found by A.D. Trench on a trip through Tanzania, and has similar drought resistant properties. DR is of French Mission Bourbon origin. Many prefer SL-28 to the other successful, widely used cultivar, SL-34.