A process is described by which the solid waste of grape resulting from processes such as vinification, is treated with hot steam, then is treated with alcoholic solutions, the alcohol being removed, then the oil residues present in the solid residue are removed. The said solid residue is then subjected to aqueous extractions, the aqueous medium is separated from the remaining solids, and this aqueous medium is concentrated. The said material is also described, being capable of emulsifying oil-in-water emulsions and provide stability to colloids.