Year: 1888

page_text: Date of Application, 27th Oct., 1888
Complete Specification Left, 30th Jan., 1889
Complete Specification Accepted, 2nd Mar., 1889
I, COURTNEY SPENCER JONES of High Street Woodford in the County of Essex,
Publisher, do hereby declare the nature of this invention to be as follows:-
:-
Invisible ink or ink which is almost colorless and therefore not visible at an ordinary
temperature, but which will manifest color when exposed to heat is well known for
writing purposes, but has not been hitherto employed in printing.
My invention consists in adapting it for use in the art of printing, with a view to
utilise it for Advertisements, and for games, or amusements and other purposes.
In doing this I employ an ink made by dissolving one or other of the following
salts, in Methylated or other Spirit, or in water, or in a mixture of Spirit and water,
in the proportion of about one ounce of the salts, to eight of spirits or water, more or
less according to the strength of the ink required.
The salts above referred to are chloride of cobalt, nitrate of cobalt, acetate of cobalt,
and other preparations of cobalt, and chloride of nickel.
To adapt ink of this description to ordinary printing purposes, special inking rollers
are required for applying the ink, or the ordinary rollers may be covered with suitable
materials to take the ink. It is necessary that the surface of the roller, should be
covered with some absorbent material, such as flannel, cloth, soft leather, or material
of a similar character. When the printing is to be done by hand, by means of a
stamp, an inking pad with a covering similar to that above described for rollers can
be used.
Ink made and used in this way dries quickly and soon becomes invisible, but on
being held to a fire, or by the application of heat becomes visible in blue, or other
coloured letters, according to which chemical is used in the manufacture of the ink.
The printing will disappear on the paper cooling, but will re-appear when heat is
again applied.
It will be seen that this process is well adapted for what may be described as puzzle
advertisements, or concealed announcements, which call forth effort, or ingenuity, to

page_text: discover their entire contents. The advantage of this is, that far more attention is
attracted to the advertisement itself, than would otherwise be the case, and amusement
is afforded to those, who are unacquainted with the method employed.
I propose to avail myself of it also in fireside games, for winter evenings, such as
fortune telling, questions and answers, and the like.
Dated this 27th day of October 1888
S. S. BROMHEAD,
97, Newgate Street, London, E.C.,
Patent Agent.
I, COURTNEY SPENCER JONES of High Street Woodford in the County of Essex
Publisher do hereby declare the nature of this invention and in what manner the
same is to be performed, to be particularly described and ascertained in and by the
following statement :-
Invisible ink or ink which is colorless, or almost colorless, and therefore not visible
at an ordinary temperature, but which will manifest color and convey a meaning when
exposed to heat is well known for writing purposes, but has not hitherto been employed
in printing.
My invention consists in adapting this invisible ink for use in the art of printing
with a view to utilise it for Advertisements or other announcements and for games or
amusements and other purposes.
In doing this I employ an ink made by dissolving one or other of the following
salts in Methylated or other Spirit or in water, or in a mixture of Spirits and water,
in proportion of about one ounce of the salts to eight ounces of spirits or water more
or less, according to the strength of the ink required.
The salts above referred to are chloride of cobalt, nitrate of cobalt acetate of cobalt
and other peparations of cobalt, and chloride of nickel, or others possessing similar
qualities or peculiarities.
To adapt ink of this description to ordinary printing purposes special inking rollers
are required for applying the ink, or the ordinary rollers may be covered with suitable
materials to take the ink. It is necessary that the surface of the roller should be
covered with some absorbent material, such as flannel, cloth, soft leather, or material
of a similar character. When the printing is to be done by hand by means of a
stamp, an, inking pad with a covering similar to that above described for rollers can
be used.

page_text: Ink made and used in this way dries quickly and soon becomes invisible but on
being held to a fire or by the application of heat becomes visible in blue or other
coloured letters according to which chemical is used in the manufacture of the ink.
The printing will disappear on the paper cooling but will reappear when heat is again
applied.
It will be seen that this process is well adapted for what may be described as puzzle-
advertisements or concealed announcements which call forth effort or ingenuity to
discover their entire contents. The advantage of this is that far more attention is
attracted to the advertisement itself than would otherwise be the case, and amusement-
is afforded to those who are unacquainted with the method employed..
I propose to avail myself of it also in fire-side games for winter evenings such as-
fortune telling, questions and answers and the like.
Having now particularly described and ascertained the nature of my said inven-
tion and in what manner the same is to be performed, I declare that what I
claim is ;
1st. The method of printing either by letter press lithography or otherwise with
invisible, or almost invisible ink, which when heated shall become coloured and legible,.
as herein explained and set forth.
2. In printing with invisible ink the use of an alcoholic or partly alcoholic solution
for dissolving the salts employed and of inking rollers or pads faced with some
absorbent material, as herein described and set forth.
Dated this 30th day of Januar 1880
S. S. BROMHEAD,
97, Newgate Street, E.C.,
Patent Agent.