Biuret Reagent TS, (U.S.P. Test Solution) is a solution, sometimes designated with "TS or Test Solution", that is prepared according to the specifications of the USP Pharmacopeial Convention, for the purpose of conducting USP and National Formulary tests and assays.

The Ricca Chemical barium hydroxide TS with composition of 97.54% water and 2.46% barium hydroxide is suitable for research and laboratory use. It can be stored at a temperature of 15 to 30 degree C.