VECTASHIELD HardSet Antifade Mounting Medium with DAPI, 10 ml, is a unique, stable formula for preserving fluorescence. VECTASHIELD Mounting Medium prevents rapid photobleaching of fluorescent proteins and fluorescent dyes. Features: Inhibits photobleaching of dyes and fluorescent proteins, Ideal refractive index, Ready to use, No warming necessary, Offered with nuclear or cytoskeletal counterstains, Available in non-hardening or hardening formulations, Can be stored without sealing for long term analysis. Easy to use. VECTASHIELD HardSet Mounting Medium preserves fluorescence and hardens after coverslipping. After approximately 15 minutes at room temperature, the coverslip will become immobilized, and optimal antifade ability and refractive index will be achieved.