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.
the color shown in the box at right is one of the many commercial varieties of umber from the iscc nbs color list iscc nbs dictionary of color names 1955 color sample of umber color sample 61 limonite or hydrated iron oxide is the basic ingredient of the earth pigments ocher sienna and umberhe color of the natural earth depends upon the amount of iron oxide and manganese in the clay umber earth pigments contain between five and twenty percent manganese oxide which accounts for their being a darker color than yellow ochre or sienna