Trypan Blue

[Na+].[Na+].[Na+].[Na+].CC1=C (C=CC (=C1) C2=CC (=C (C=C2) N=NC3=C (O) C4=C (N) C=C (C=C4C=C3[S] ([O-]) (=O) =O) [S] ([O-]) (=O) =O) C) N=NC5=C (O) C6=C (N) C=C (C=C6C=C5[S] ([O-]) (=O) =O) [S] ([O-]) (=O) =O

Trypan Blue (Visionblue, Diphenyl Blue, Direct Blue 14) is a colorimetric dye that stains dead cells with a blue color easily observed using light microscopy at low resolution.