osein to 50 parts
of hot water; agitate well at intervals; let it cool, and after twelve
hours filter through a fine linen cloth, and add a few drops of carbolic
acid to each pint. This may be diluted with three times its volume of
water, and still form a good ink for ordinary pens.

INK FOR RUBBER STAMPS.

Aniline (red violet), 16 parts; boiling distilled water, 80 parts;
glycerine, 7 parts; molasses, 3 parts.

CARDINAL INK.

Improved cardinal ink for draughtsmen is made as follows:--Triturate 1
gram of pure carmine with 15 grams of acetate ammonia solution and an
equal quantity of distilled water, in a porcelain mortar, and allow the
whole to stand for some time. In this way a portion of the alumina which
is combined with the carmine dye is taken up by the acetate acid of the
ammonia salt and separates as precipitate, while the pure pigment of the
cochineal remains dissolved in the half saturated ammonia. It is now
filtered and a few drops of pure white sugar syrup added to thicken it. In
this way an excellent red drawing ink is obtained, which holds its color a
long time. A solution of gum arabic cannot be employed to thicken this
ink, as it still contains some acetic acid, which would coagulate the
bassorine, one of the natural constituents of gum arabic.

AN ARTICLE FOR LABELING BOTTLES.

A very useful article for labeling bottles containing substances which
would destroy ordinary labels consists of a mixture of ammonium fluoride,
barium sulphate and sulphuric acid, the proportions for its manufacture
being: barium sulphate, 3 parts; ammonium fluoride, 1 part; and sulphuric
acid enough to decompose the fluoride and make a mixture of semi-fluid
consistency. This mixture, when brought in contact with a glass surface
with a common pen, at once etches a rough surface on the parts it comes in
contact with. The philosophy of the action is the decomposition of the
ammonium fluoride by the acid, which attacks the glass; the barium
sulphate is inert, and is simply used to prevent the spreading of the
markings. The mixture must be kept in bottles coated on the inside with
paraffine or wax.

HOW TO REMOVE ANILINE INK FROM THE HANDS.

Aniline inks are now in common use, especially in connection with the
various gelatine tablets for multiplying copies of written matter. Upon
the hands it makes annoying stains, difficult of removal by water or
acids. They may be easily washed out by using a mixture of alcohol 3