unces of distilled water, mix six
drachms of white sugar, and ten drachms of powdered gum arabic, half
an ounce of archil, and water to make up six ounces in measure.

2486a. Ink for Zinc Garden Labels.

Verdigris, one ounce; sal-ammoniac, one ounce; lampblack, half an
ounce; water, half a pint. Mix in an earthenware mortar, without using
a metal spatula.

_Directions_.--To be shaken before use, and used with a clean _quill_
pen, on bright zinc.

_Note_.--Another kind of ink for zinc is also used, made of chloride
of platinum, five grains, dissolved in one ounce of distilled or rain
water; but the first, which is much less expensive, answers perfectly,
if used as directed, on clean bright zinc.

2486b. Manifold Writing [1].

The demand for a rapid and simple method of multiplying letters,
circulars, &c., has led in recent years to the invention of several
ingenious processes. So few copies are obtainable by the ordinary
reporters' system of sheets of tissue paper, or "flimsy," interleaved
with sheets of prepared black paper, that various kinds of "graphs"
have been produced, by which upwards of a hundred, and in some cases
many more, copies may be produced from one writing.

The "graph" process usually consists of transferring a writing made in
an aniline dye on to a gelatine surface, from which, by the
application of successive sheets of paper, subjected to a smoothing
pressure by the hand, a number of copies may be obtained, in a manner
very similar to the ordinary lithographic process. All those which may
be classed as "gelatine transfer" processes are, however, open to the
objection that, after a certain number of copies, the colour grows
very faint.

Some other methods of manifold writing, such es the Edison, the
Trypograph, the Cyclostyle, &c. (by which 1,000 copies can be taken
from one writing), do not possess this fault, being based on a
principle of a fine stencil on prepared paper, and squeezing ink
through the minute perforations on to a sheet of paper fixed
underneath. The writing in these stencil systems, however, has a
"dotty" and broken appearance, displeasing to many eyes--the
Cyclostyle being, perhaps, least faulty in this respect. For those who
would like to make a gelatine "graph," we append the following recipe:

Six parts by weight of pure glycerine, four parts by weight of water,
two parts of barium sulphate,