A sulphate may be present.
Take a portion of the liquid, evaporate to dryness, and incinerate; a
sulphate, if present, will be obtained, and may be tested.
_Caution._--Sulphuric acid may not be found even after large doses, due
to treatment, vomiting, or survival for several days. In all cases every
organ should be examined. Vomited matters and contents of stomach should
not be mixed, but each _separately_ examined. This rule holds good for
all poisons. On _cloth_ the stain may be cut out, boiled in water, the
solution filtered, and tested with blue litmus and other tests.
_Post-Mortem Appearances._--Where the acid has come in contact with the
mucous membranes there are dark brown or black patches. The stomach is
greatly contracted, the summits of the mucous membrane ridges being
charred and the furrows greatly inflamed; the contents are black or
brown.
_Tests._--Concentrated acid chars organic matter; evolves heat when
added to water, and sulphurous fumes when boiled with chips of wood,
copper cuttings, or mercury. Dilute acid chars paper when the paper is
heated; gives a white precipitate with nitrate or chloride of barium,
and is entirely volatilized by heat.
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