This product is a 10X concentrated stock solution. Prepare a 1X working solution by diluting 1 part 10X concentrate with 9 parts distilled-deionized water or equivalent. 10X TBS Fish Gel Concentrate consists of 1.0 M Tris hydrochloride, 1.5 M sodium chloride and Fish Gelatin at pH 7.5. A proprietary combination of stabilizers and preservatives are used that are azide and mercury free.