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GIGGLE WATER
dried. If the wine contain logwood, the paper will assume
a violet-blue color; but if the wine possess its natural
coloring matter the paper will have a grey tint.
287. TO DETECT ARTIFICIAL COLORING IN
WINE
Use, as test liquid, a solution of potash and a solution
of liquid ammonia and potash. If the wine is colored by
the coloring matter of the grape, potash changes the red
color to a bottle green or brownish-green); ammonia
changes the color to brownish-green or greenish-brown;
a solution of alum to which some potash has been added
gives a dirty grey precipitate.
If the wine is artificially colored, potash gives the fol
lowing colored precipitates: Dark elder, mulberry, or
beet root gives a violet precipitate; pokewood berries, a
yellow; Indian wood, a violet red; pernambuco, a red; lit
mus, a violet blue; orchil or cudbear, a dirty lees color.
Or: Pour into the wine to be tested a solution of alum,
and precipitate the alumina it contains, by adding potash,
and the precipitates will have the same characteristics as
above.
288. GRAPE CHAMPAGNE
Gather the grapes when they are just turning or about
half ripe; pound them in a tub, and to every quart of
pounded fruit add 2 quarts of water. Let it stand in the