Herstellung weißer, pigmentfreier Lackfilme auf Basis von Polysaccharid-Mikroschäumen

White pigment-free coating material (A) comprises a water-in-oil emulsion from a polymer soluble in a hydrophobic organic solvent and water, where the polymer is a polysaccharide derivative, the polymer is in continuous phase and water is in disperse phase. Independent claims are included for: (1) producing a white coating on a substrate comprising applying (A) on the substrate; and (2) white pigment-free coating obtained by coating (A).