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dark grey color and opaque. * * * * * 13. Oxide of Uranium, U^{2}O^{3}. Behavior with Borax on Platinum wire in the oxidizing flame. Behaves similarly to oxide of iron, with the exception that the color of the former is somewhat paler. When sufficiently saturated, the glass may be rendered of an opaque yellow by an intermittent flame. in the reducing flame. Affords the same color as the oxide of iron. The green glass obtained in this flame, if sufficiently saturated, can be rendered black by an intermittent flame, but it has under these circumstances no enameline appearance. On charcoal, with the addition of tin, the glass takes a dark green color. Behavior with Mic. Salt on Platinum wire in the oxidizing flame. Dissolves to a clear yellow glass, which assumes a yellowish-green color on cooling. in the reducing flame. The glass assumes a beautiful green color, which becomes more brilliant as the bead cools. The addition of tin upon charcoal produces no further change. * * * * * 14. Oxide of Copper, CuO. Behavior with Borax on Platinum wire in the oxidizing flame. Produces an intense coloration. If in small quantity, the glass is green, while warm, and becomes blue on cooling. If in large proportion, the green color is so intense as to appear black. When cool, this becomes paler, and changes to a greenish blue. in the reducing flame. If not too saturated, the cupriferous glass soon becomes nearly colorless, but immediately on solidifying assumes a red color and becomes opaque. By long continued blowing on charcoal, the copper in the bead is reduced and separates out as a small metallic bead, leaving the glass colorless. With the addition of tin, the glass becomes of an opaque dull-red on cooling. Behavior with Mic. Salt on Platinum wire in the oxidizing flame. With an equal proportion of oxide, this salt is not so strongly colored as borax. A small amount imparts a green color in the warm and a blue in the cold. With a very large addition of oxide, the glass is opaque in the hot state, and after cooling of a greenish-blue. in the reducing flame. A tolerably saturated glass assumes a dark
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