Valpolicella Ripasso is a form of Valpolicella Superiore made with partially dried grape skins that have been left over from fermentation of Amarone or recioto. Winemaking in the region has existed since at least the time of the ancient Greeks.
Barium chloride, or any other barium salt, should burn with a green flame. When a barium salt is burned, the thermal energy is transferred to the outer electrons of the barium ions. They gain enough energy to excite them to a higher energy level. They then drop back to their ground state, releasing energy.
indicator bromythol blue in OF medium. 2 tubes used, one sealed, the other open.turns yellow in the presence of acids,indicating catabolism of carbohydrates.dark blue/black color is produced in the presence of alkaline solution due to the use of pepton and npt carbohydrates because ammonia is produced.