Abberior Mount Solid is an aqueous mounting medium designed for confocal and superresolution microscopy. The refractive index (before hardening) is identical to that of many biological samples (n=1.38). Specimen mounting using Abberior Mount Solid is convenient since no dilution series is required. After specimen mounting, the embedding medium is hardening. So sealing of the mounted specimen with nail polish or similar is not required. It is available either pure or with addition of antifading reagents.