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.
Gas Range Flame Characteristics. When burning natural gas, the burner flames should be almost completely blue with possibly a small hint of yellow in the center of the flame as seen in figure A above. When burning liquid propane (LP), the flames will usually have a yellow tip as seen in figure B.