Tipping refers to a roast error that can be discerned by inspecting the roasted coffee, where the ends of the elongated bean appear burnt. It can easily be tasted in the cup too; burnt or smoke flavours, or a lack of sweetness. It is usually the result of an over-heated roast environment (initial drum temperature too high), an over-charged roast drum (too much coffee in the drum), or possibly not enough air movement. Natural coffees from lower-grown sites can be more susceptible to tipping and scorching.