By MR. BONNEVILLE.
To a cold solution containing 1 per cent. of bromine, 1 per cent. of
caustic soda at 36 deg. B. is added, then the material, to be bleached is
first wet and then immersed in this bath until completely decolorized.
It is passed into a newly-acidulated bath, rinsed, and dried. After the
bromine bath has been used up, it is regenerated by adding 1 per cent.
of sulphuric acid, which liberates the bromine. To the same bath
caustic soda is added, which regenerates the hypobromite of soda. The
hydrofluosilicic acid can be used, instead of the sulphuric acid, with
greater advantage. A bath used up can also be regenerated by means of
the electric current.
* * * * *
DETECTION OF MAGENTA, ARCHIL, AND CUDBEAR IN WINE.
These colors are not suitable for converting white wine into red, but
they can be used for giving wines a faint red tint, for darkening pale
red wines, and in making up a factitious bouquet essence, which is added
to red wines. The most suitable methods for the detection of magenta are
those given by Romei and Falieres-Ritter. If a wine colored with archil
and one colored with cudbear are treated treated according to Romei's
method, the former gives, with basic lead acetate, a blue, and the
latter a fine violet precipitate.
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