parts, and glycerine 1 part.

AN INK WHICH CANNOT BE ERASED.

An ink which cannot be erased from paper or parchment by any known
chemical solvent, and will retain its original color indefinitely, and
last as long as the material on which it is written, is made as
follows:--Make a solution of shellac in borax, to which add sufficient
lampblack to give the requisite depth of color.

TO MAKE BLACK INK.

Lactate of iron, 15 grains; powdered gum arabic, 75 grains; powdered
sugar, half a drachm; gallic acid, 9 grains; hot water, 3 ounces. (Lactate
of iron is a novelty in ink-making, and the above formula may possibly
suit those who have a taste for writing with mucilaginous matters instead
of limpid solutions.)

Black Ink for Stencils.

The following is commended for the preparation of a black ink or paste for
use with stencils:--Boneblack, 1 lb.; molasses, 8 ozs.; sulphuric acid, 4
ozs.; dextrine, 2 ozs.; water sufficient. Mix the acid with about two
ounces of water, and add it to the other ingredients, previously mixed
together. When the effervescence has subsided, enough water is to be added
to form a paste of convenient consistence.

MARKING INK.

Put two pennyworths' lunar caustic (nitrate of silver) into half a
tablespoonful of gin, and in a day or two the ink is fit for use. The
linen to be marked must first be wet with a strong solution of common
soda, and be thoroughly dried before the ink is used upon it. The color
will be faint at first, but by exposure to the sun or the fire it will
become quite black and very durable.

BLUE MARKING INK FOR WHITE GOODS.

Crystallized nitrate of silver, dram 1
Water of ammonia, drams 3
Crystallized carbonate of soda, dram 1
Powdered gum arabic, drams 1-1/2
Sulphate of copper, grains 30
Distilled water, drams 4

Dissolve the silver salt in the ammonia; dissolve the carbonate of soda,
gum arabic, and sulphate of copper in the distilled water, and mix the two
solutions together.

BLUE-BLACK WRITING PAPER.

Take of Aleppo galls, bruised, 9 ozs.; bruised cloves, 2 drachms; cold
water, 80 ozs.; sulphate of iron, 3 ozs.; sulphuric acid, 70 minims;
indigo-paste, 4 drachms. Place the galls and the cloves in a gallon
bottle, pour upon them the water, and let them macerate, with frequent
agitation, for a fortnight. Press, and filter through paper into another
gallon bottle. Next, put in