Evening star. [volume] (Washington, D.C.) 1854-1972, 1892-04-09

invssiese kinas for secrct wrssins.-Coi.r>.
Inks and India Ink

1nhs and India Ink.
s. is VERY EASY TO MAKE AN N
- visible ink II You wish 10 insure special
secrecy for your correspondence. aid =
chemist 10 q writer for THr srAn. -sYou have
only 10 DO your writing with q solution Of
sugar Of lead in pure wsssr. adding 10 the nix
turs small amount Of gum arabic, 90 tina, IL
may how wen from the pen. The letters traced
with this preparation are not visible shen 10
has become dry. but when the manuscript 10
held over q Jet Of sulphuretsed hyaroeea gas
they come out intensely black. This gas 10 the
same rs that generated in bad eggs. GO that
one or two Of those might serve 10 do the read
ing by. However. one may avoid the necessity
OF being tortured with unpleasant odors by
selecting some other chemical for an ink.
AsorHrR PREPARATION.
There Do nothing better for the purpo0
than bromide Of copper. which you can prepare
Tor yourself by mixing one part Of bromide Of
potash. one part Of blue vitriol and eight parts
81 water adding little alcohol and gum arabic.
writing done In TIN. solution 10 absolutely In
Visible until exposed TO heat when 10 iuame-
diaiely become legtble. Any dealer in cbemi-
cal supplies VIII sell you chloride OF cobalt 10
pink script. which disappears when dry, be-
comes green when heated. disappears when
cold and Is pink again when damp Writing
1one IN iiee water cannot b. seen when ID 10 dry,
but turn. blue when iodine IL applied 70 H. Il
was much employed during the great musiny
In India. Invisible inks have been suersssed
for postal cards.
now coIoRrD fSKs ARr MADE.
'Colored inks are made In all sorts OF ways
out OF sniine dyes. dye woods and chemicals
OF various kinds. Groand Brazil wood IL used
for red ink, eampeachy wood for purple. log
wood Tor violet, sulphase Of indigo Tor blue
and verdigris and cream OF tartar for green
Soai-tsr colors may be employed in place OF
these; You can manufacture for yourself an
efeelient black writing ink by soaking pound
OF bruised gals for twenty -four hours in boil
water, straining the liquid and adding fvs
ounces oil sulphate OF iron. three ounces Of
gum arabic and q few drops Of csrbolic acid.
ne gsh nuid acts upon she sulphats Of iron,
making an Intense black and the carbolic acid
Is Intended 10 keep the ink from becoming
moidy. TO make copying INK you have oniy
10 NIX three pints OF the black ink with one
pint OF glycerine.
INDIA INK.
The basis OF india ink is lAmpblack. which
10 made In furnace specially constructed for
the purpose. Various kinds Of oils and grsss,
are burned 70 produce the lsmpblack. but the
INES, nnes, quality Is obtained from pork fat. The
lsmpoiach subjected 10 a sitting proceus
through siik bags iu order that it shall be rem
aered ar me as possible. In the manufacture
OF the lux the first step 10 10 melt Ia . pot q
quantity OF a particularly excellent glue from
buffalo hides. To tins ~ much iampbiack in
added AZ ~iu compose . soft paste, which Ia
kneaded with the hands. o small quantity of
pea oii being put Ia also. Tue mixture 10 made
INTO fiat cakes ana left TO 'ripen for q while
after which At IL compressed in cylindrical
moids The cylinders. in which shape the
product IL sent to market are dried and given
n hnai polish on the outside by brushing them
OF white WAX which 10 Deposited ON tree. in
china by insects. little musk or Borneo
camphor added 20 the paste while IL IL hot
gives its peculiar odor 70 the best kind Of india
ink"