Our Methenamine-Silver Compound is compatible with our G.M.S. Stain Kit or yours. Each vial makes 50ml working solution when waters is added. Sodium Borate Solution is provided. Now your G.M.S. stains can receive the WOW Factor in just fifteen minutes. Watch the video to see methenamine silver preparation in action. 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.