Abstract: The invention relates to a printed document of value having at least one authenticity feature in the form of a luminescent substance based on doped host lattices. The host lattice has a strong crystal field and is doped with at least one chromophore with the electron configuration (3d)2.

Abstract: The invention relates to a printed document of value having at least one authenticity feature in the form of a luminescent substance based on doped host lattices. The host lattice has a strong crystal field and is doped with at least one chromophore with the electron configuration (3d)2.

Abstract: A two-component material based on curable prepolymers and conventional additives is described which, unlike conventional two-component materials, contains hardenable prepolymer in both individual components, the prepolymer in the first component being a polyurethane prepolymer with free NCO-groups and the prepolymer in the second component is a polymer with free SH-groups. The first component contains curing agent and optionally accelerator for the polymer with free SH-groups and the second component contains curing agent and optionally accelerator for the polyurethane prepolymer with free NCO-groups. Through the use of two prepolymers, the two components of the two-component material can be used in a volume ratio favorable for practical purposes. It is also possible to set the viscosity and density of the two individual components to roughly the same values, so that no problems are caused when mixing the two components.