uminium bronze or phthalocyanine blue. [0220] Examples of fillers are talc, alumina, aluminium silicate, barytes, mica, and silica. [0221] Flow control agents and thixotropic agents are based, for example, on modified bentonites. [0222] Adhesion promoters are based, for example, on modified silanes. [0223] The claimed fluorescent compounds can be added to the coating material during its preparatio