Sercial is the lightest—in body, color, and residual sugar—level of the fortified wine Madeira. At one time, Sercial also indicated that the wine was made from this grape varietal, but this is no longer true. In ascending order of sweetness Madeira is classified as Malmsey, Bual, Verdelho, and Vercial. FYI, "rain water" Madeira is a light, diluted version of Sercial.