Aqua-Regia. (See [Nitro-Hydrochloric Acid.])
Baryta, Nitrate of. (See [Nitrate of Baryta.])
Bichloride of Mercury.
(See [Mercury, Bichloride of.])
Bromine.
Symbol, Br. Atomic weight, 78.
This elementary substance is obtained from the uncrystallizable residuum of sea-water, termed bittern. It exists in the water in very minute proportion, combined with magnesium in the form of a soluble bromide of magnesium.
Properties.—Bromine is a deep reddish-brown liquid of a disagreeable odor, and fuming strongly at common temperatures; sparingly soluble in water (1 part in 23, Lowig), but more abundantly so in alcohol, and especially in ether. It is very heavy, having a specific gravity of 3·0.
Bromine is closely analogous to chlorine and iodine in its chemical properties. It stands on the list intermediately between the two; its affinities being stronger than those of iodine, but weaker than chlorine. (See [Chlorine.])
It forms a large class of salts, of which the bromides of potassium, cadmium, and silver are the most familiar to photographers.
Bromide of Potassium.