It should then be mixed with black flux or dry ferrocyanide of potassium and reduced, as already described.
Charcoal or even oil may be substituted for black flux, and a retort of hard glass may be used, with the same result.
It melts at the flame of a candle, and may be reduced when heated along with iron or black flux, which are distinctive characters.
By heating the oxide left by igniting pure acetate of lead with black flux.
The "black flux," which may be obtained by heating tartar, is a mixture of carbonate of potash and charcoal.
In like fashion corrosive sublimate itself may be reduced and volatilized if heated with black flux.
Tartar and "black flux," are reducing agents as well as fluxes.
This precipitate is of a greenish blue colour, and requires a much greater quantity of the black flux to reduce it.
black flux is obtained when equal parts of nitre and tartar are deflagrated.
For this purpose it must be finely pulverized, thoroughly mixed with some black flux, and melted in a covered crucible.