Bismarck daily tribune. [volume] (Bismarck, Dakota [N.D.]) 1881-1916, 1907-08-16
SECRET MlsSIvEs.
Solutions That produces Writing IN
visible Until Treated.

Solutions That produces Writing IN
visible Until Treated.
Ovid, iii his "Art Of Love, teaches
young women to deceive their guar'di-
ans by writing their love letters with
new milk aud TO make the writing APP
pear by rubbing coal dust over the |
paper ANY thick aud yiseous hui ifl' |
such as the glutinous and colo OIL SIS
juices Of plants, aided by any colored |
powder. will answer the purpose
equally we'll a quill pen should be
used.
The most common method is to
pen an epistle In ordinary ink, inter-
lined with the invisible words. which 1
doubtless has given rise to the S ex-
preston. reading between the lines, Z
in order to discover the true meaning
Of communication Letters written
with a solution of gold, silver. copper,
tin or mercury dissolved in aqua for
tbs, or, simpler still, of iron or lead in
vinegar, with water added until the
liquor does not stain the white pa
per, will remain invisible for two or
three months If kept in the dark. but
on exposure for some hours to the
open air will gradually acquire color
or will do so Instantly on being held
before the fire. Each of these solu
lions gives its own peculiar color to
the writing gold a deep violet, silver
slate, and lead and copper brown.
There is q vast number of other
solutions that become visible on ex-
posture to heat or when having a
heated iron passed over them. The ex-
| PLANTATION is that the matter is readily
burned to a sort Of charcoal. Sim
/ plest among these are lemon juice and
milk, but the one that produces the
best results is made by dissolving q
scruple Of sal ammoniac in two ounces
OF water
! Several years ago Professor Bray
lants Of the University Of Louyain dis
covered method In which no ink
at all was required to convey Sc
/ cret message He laid several sheets
! OF note paper on each other and wrote
4 on the uppermost with a pencil. then
selected one Of the under sheets on
. which no marks of the writing were
visible. On exposing this sheet TO the
vapor, Of iodine for few minutes II
turned yell0wish, and the writing ap.
peared of violet brown color. On
further moistening the paper it turned
blue, and the letters showed in violet
lines. The explanation is that note
paper contains starch, which under
pressure becomes .fydramide" and
turns blue In the iodine fumes. II
Is best to write on q hard surface
say a pane Of glass SuIphuric aciG
4 gas will make the writing disappear
1 again, and it can be revived q secone
/ time. "a ,y5s
One Of the simplest secret writings
however, to which Professor Gross o.
Germany calls attention as being uset
in prisons, is the following:
Take sheet of common writing pa
per, moisten it well with clear Watel
and lay it on q hard, smooth surface
such as glass, tin, stone, etc. Afte
removing carefully all air bubbles from
the sheet place upon It another DIR.
q sheet of equal size and write; upon /
your communication with a sharl
4 pointed pencil or a simple piece Q
q pointed hard wood. Then destroy tn
dry paper upon which the. writing ha
been done and a How the wet paper +
& dry by exposing it to the air, but mot t
& the heat of fire OF the flame of q lamp
!. When dry not a trace of the Writfn
WIFI be visible. But on moistenfng til
sheet again with clear water and hoid
!. ing it against the light the. wrttin
can be read in a clear TRANSPARENCY
Tt disappears again after ing In th
air and may be reproduced BY moi
tening a great number Of time
Should the sheets be too mach heates
however, the writing will disappea
J never to reappear again ,shicago Re
! ord Herald.