Labeled polymer dispersion obtainable therefrom and adhesives

The invention relates to a polymer dispersion containing water, at least one producible by emulsion polymer and at least two ions or elements selected from the group consisting of Li, Ba, Sr, B, Co, Cu, Mn, Mo, Ni, Ag, Pb , Zn, W, La, Ce or Sn, or at least in each case a salt of at least two such elements.