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Sab Dic 26 11:33:24 CET 2009

H it is spread. In order to detect the litharge or sugar of lead, a few
drops of the solution of yellow orpiment and quicklime should be poured
into a glass of wine. If the colour of the liquor change, and become
successively dark red, black or brown, it is an evident proof of its
being adulterated with lead. As orpiment is poisonous, it would be
better to use a few drops of vitriolic acid for this purpose, which
should be introduced into a small quantity of the suspected liquor. This
will cause the lead to sink to the bottom of the glass, in the form of a
white powder. A solution of hepatic gas in distilled water, if added to
wine sophisticated with lead, will produce a black sediment, and thus
discover the smallest quantity of that poisonous metal; but in pure
wine, no precipitation will take place. The following preparation has
been proved to be a sufficient test for adulterated wine or cider. Let
one dram of the dry liver of sulphur, and two drams of the cream of
tartar, be shaken in two ounces of distilled water, till the whole
become saturated with hepatic gas: the mixture is then to be filtered
through blotting paper, and kept in a vial closely corked. In order to
try the purity of wine, about twenty drops of this test are to be poured
into a small glass: if the wine only become turbid with white clouds,
and a similar sediment be deposited, it is then not impregnated with any
metallic ingredients. But if it turn black or muddy, its colour approach
to a deep red, and its taste be at first sweet, and then astringent, the
liquor certainly contains the sugar, or other 
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