Tissue sections, cytological preparations, bacteriological samples or blood smears are covered with a cover glass and an inclusion medium for permanent preservation. An important requirement is permanent storage for the legally required storage periods and, in the case of scientific preparations, beyond. The choice of roofing material depends in particular on the solubility properties of the dyestuffs used. Our portfolio of microscopy reagents includes aqueous and non-aqueous covering agents. The covering media are CE-certified in vitro diagnostics and are therefore suitable for clinical diagnostics as well as for scientific and teaching preparations.