_Tests._--Polished steel put into a solution containing a copper salt
receives a coating of metallic copper. Ammonia gives a whitish-blue
precipitate, soluble in excess. Ferrocyanide of potassium gives a rich
red-brown precipitate. Sulphuretted hydrogen gives a deep brown
precipitate.
XXVI.--ZINC, SILVER, BISMUTH, AND CHROMIUM
The salts of zinc requiring notice are the sulphate and chloride.
=Sulphate of Zinc= has been taken in mistake for Epsom salts. In large
doses it causes dryness of throat, thirst, vomiting, purging, and
abdominal pain.
_Post-Mortem Appearances._--Those of inflammation of digestive tract.
_Treatment._--Tea, decoction of oak-bark, carbonate of potassium or
sodium as antidote.
=Chloride of Zinc.=--A solution containing this substance (230 grains to
the ounce) constitutes 'Burnett's disinfecting fluid.' It is a corrosive
poison.
The symptoms are burning sensation in the mouth, throat, stomach, and
abdomen, followed by vomiting, diarrhoea, with tenesmus and distension
of the abdomen. The vomited matter contains shreds of mucous membrane
with blood. There is profound collapse, cold surface, clammy sweats,
weak pulse, with great prostration.
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