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.
Bismarck Brown - colors acid mucins, a type of protein, yellow and may be used to stain live cells. Carmine - colors glycogen, or animal starch, red. Coomassie blue - stains proteins a brilliant blue, and is often used in gel electrophoresis. Crystal violet - stains cell walls purple when combined with a mordant. This stain is used in Gram staining. DAPI - a fluorescent nuclear stain that is excited by ultraviolet light, showing blue fluorescence when bound to DNA.