ORIGIN.--Yellow mercuric oxide is obtained by the interaction of
mercuric chloride and sodium hydroxide.
PROPERTIES.--Mercuric oxide is of a yellow color, similar to that of the
yolk of egg, and is a completely amorphous powder; odorless, and having
a somewhat metallic taste; permanent in the air, but turning dark on
exposure to light; insoluble in water or alcohol.
ACTIONS.--A stimulant caustic and anesthetic.
USES.--The official ointment of yellow mercuric oxide is prescribed as a
stimulant and anesthetic in chronic inflammation and ulceration of the
eye (4 gr. of yellow mercuric oxide to 1 oz. of vaseline). It is also
employed on skin diseases, indolent ulcers, swollen glands and
granulated wounds.