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 odour, and fuming strongly at common temperatures; sparingly soluble in water (1 part in 23, Löwig), 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.
Symbol, KBr. Atomic weight, 118.