(3) on charcoal. Fuses readily and incrusts the charcoal with [...Sb] and [.Pb] leaving a dark colored bead.
(5) in borax. If the bead obtained on charcoal be fused on that support in the reducing flame with borax, a slight iron reaction is obtained, and after a time a copper reaction.
(7) with carb. soda. Yields a bead of metallic copper and lead and incrusts the charcoal with [...Sb] and [.Pb]. The alkaline mass laid on silver and moistened gives the sulphur reaction.
(2) in open tube. Is converted into the black oxide CuO.
(3) on charcoal. In the reducing flame is reduced, forming a bead of metallic copper.
(4) in forceps. Fuses and colors the the flame emerald green, or if previously moistened with HCl, blue.
(7) with carb. soda. Is reduced to a bead of metallic copper.
(1) in glass-bulb. Gives off much water, having an acid reaction, on test paper, and forms a light grey sublimate of CuCl.
(3) on charcoal. Fuses, colors the flame blue, forms a brown and a pale grey incrustation on the charcoal, and is reduced to metallic copper, leaving a small quantity of slag.
(4) in forceps. Fuses and colors the outer flame intensely blue and green towards the point.
(5) in borax. Gives the copper reactions.
(7) with carb. soda. Is reduced, yielding a bead of metallic copper.
(1) in glass-bulb. Gives off water and turns black.
(3) on charcoal. In the oxidizing flame becomes black. In the reducing flame red.
(4) in forceps. V. Colors the outer flame intensely green.
(5) in borax. Gives the copper reactions.
(6) in mic. salt. As with borax. The silica remains undissolved.
(7) with carb. soda. With a small quantity of carbonate of soda fuses to a bead, which on cooling is opaque and has a red fracture. With more alkali forms a slag, containing little beads of reduced copper.
(1) in glass-bulb. Gives off water and turns black.
(3) on charcoal. Fuses to a bead with a strong flame is reduced to metallic copper.
(4) in forceps. Fuses and colors the outer flame brilliantly green.
(7) with carb. soda. Yields metallic copper.
(8) Special reactions. Dissolves in HCl with much effervescence.
(1) in glass-bulb. Intumesces, gives off water and becomes white.
(2) in open tube. Strongly heated is decomposed, given off SO^{ 2} and being converted into CuO.