THE fact that a nearly colourless solution of 2 : 3 : 5 triphenyl tetrazolium chloride (tetrazolium salt) is reduced to a red formazan in contact with living tissue has been recognized for some time.

Jaclyn K. Borza, Paula R. Westerman, Matt Liebman, Comparing Estimates of Seed Viability in Three Foxtail (Setaria) Species Using the Imbibed Seed Crush Test with and without Additional Tetrazolium ...