It is best, even at ordinary temperature, to place the receiver in an ice bath.

For manner of using, see farther on, under head of Accelerators.
Bromides .-- A bromide treated with oil of vitriol, disengages chlorohyadic acid; but vapors of bromine are constantly disengaged, at the same time imparting a brown color to the gas.

If the bromide be treated with a mixture of sulphuric acid, and peroxide of manganese, bromide is only disengaged.

A solution of a bromide gives, with of nitrate {76} silver, a light yellowish white precipitate of bromide of silver, which is insoluble in an excess of acid, and readily dissolves in ammonia.

The precipitated bromide is colored by light like the chloride, but is immediately tinged brown, while the chloride assumes at first a violet hue.