3% Sodium Hydroxide is a component for the following MasterTech Stain Kits: Helico*Stat®, Rapid Helicobacter Stain Kit and Chandler's Precision® Reticulum Stain Kit. Running out of a component in your MasterTech Stain Kit? Replace your used or expiring item by purchasing an individual solution. Components are available in larger sizes to fit your rate of usage.