No. 3.
Stannous chloride 1 dr.
Distilled water 4 "

Moisten the place to be written upon with No. 1 and rub a warm iron
over it until dry; then write with No. 2, and, when dry, moisten with
No. 3. An intense and beautiful purple-red color is produced in this
way. The following simpler and less expensive method of obtaining an
indelible red mark on linen has been proposed by Wegler: Dilute egg
albumen with an equal weight of water, rapidly stir with a glass rod
until it foams, and then filter through linen. Mix the filtrate with a
sufficient quantity of finely levigated vermilion until a rather thick
liquid is obtained. Write with a quill, or gold pen, and then touch
the reverse side of the fabric with a hot iron, coagulating the
albumen. It is claimed that marks so made are affected by neither
soaps, acids nor alkalies. This ink, or rather paint, is said to keep
moderately well in securely stoppered bottles, but we should not rely
on it as a "stock" article. A white paint for marking dark colored
articles might be made by substituting zinc white for the red pigment
in the foregoing formula.--Druggist's Circular.

BROWN OR BLACK DISCOLORATION OF SILVERED MIRRORS.--Generally these
spots are due to faulty manipulation, too great dilution of the silver
solution, or touching the plates with the fingers after they have been
cleaned. Sometimes, however, they are due to chemical defects in the
glass itself. In these cases, as a general thing, the discolorations
occur only after several days--a faultless mirror having been made at
first, and the browning subsequently developing slowly. The writer was
a student in the laboratory of Baron Liebig during the time that
distinguished chemist was carrying out the series of experiments which