Precise dosing, long shelf life and easy handling make the tablet reagent the most popular indicator system and the cheapest way to have analyse a parameter. The tablet reagent in the aluminium blister pack withstands almost all climatic conditions and external influences. In addition, there is no safety risk for the user.
Resazurin (7-Hydroxy-3H-phenoxazin-3-one 10-oxide) is a blue dye, itself nonfluorescent until it is reduced to the pink colored and highly red fluorescent resorufin. It is used mainly as an oxidation-reduction indicator in cell viability assays for bacteria and mammalian cells. Available commercially as the sodium salt in tablets.