| abstract |
Indicator system containing a composition, containing at least one NCO-reactive compound and at least one polyisocyanate, and at least one indicator dye, in which the at least one indicator dye has at least one basic xanthene structure, for the visualization of the curing of the composition by changing the color of the at least one indicator dye, characterized in that the at least one indicator dye has a first color after contact with the uncured composition and is colorless in the cured composition. |