Improvements in Inks for Use in Printing from Engraved Plates.
Year: 1896

page_text: Date of Application, 27th Nov., 1896
Complete Specification Left, 27th Aug., 1897-Accepted, 6th Nov., 1897
The soap and carbonate of soda are dissolved in a half pint of water to a quarter
ound of above body to which aniline color is afterwards added to the required
int.
The preparation thus formed is first brushed into the engraved plate a docteur
lade is then drawn over the plate and the superfluous ink removed from its face.
o the body I may in some cases add a drying agent such as dextrin.
Some security papers have a tendency by chemical synthesis with the ink or
olor composition to change their original body color, I may in such case add an
Ikaline or other suitable preparation to counteract such action.
Dated this 27th day of November 1896.
FRANCIS M. ROGERS,
21 Finsbury Pavement London, E.C. Agent for Applicant
Improvements in Inks for Use in Printing from Engraved Plates.
I, RICHARD WEBB, of 9 Ludlow Street Goswell Road St. Lukes, London,
Lithographic Printer, 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:-
My invention consists in an improved composition for what are known as
"Docteur" or security inks used for copper and steel plate printing. The com-
position is formed as follows:-

page_text: The soap and the Carbonate of Soda are dissolved in a half pint of water to a
quarter pound of above body to which aniline color is afterwards added to the
required tint. The preparation thus formed is first brushed into the engraved
plate, a Docteur blade is then drawn over the plate and the superfluous ink removed
from its face. To the body I may in some cases add a drying agent such as
dextrin. Some security papers have a tendency by chemical synthesis with the ink
or color composition to change their original body color. I may in such case add
an alkaline or other suitable preparation to counteract such action.
To enable my invention to be better understood I will now describe the
admixture and treatment of the ingredients in detail:-
The
Flour in the proportion of fourfifths and magnesium oxide one fifth are first
thoroughly admixed and incorporated in a pan mortar or other suitable vessel.
For every quarter of a pound of the base thus formed I take about half a
pint
of water and place it with one drachm of carbonate of soda and two or three
drachms of best yellow soap in a pot or other boiling vessel which is set upon a
stove or the like to boil, or until the soap and carbonate are dissolved.
solution is then poured into the pan and thoroughly admixed with the base care
being taken that no lumps of dough are formed. To this composition Aniline
colouring is added so as to attain the required shade. The preparation thus
formed is first brushed into the engraved plate, a Docteur blade is then drawn
over the plate and the superfluous ink removed from its face. In winter or in
wet weather if the ink does not dry quickly enough a little dextrine may be added.
In the case of papers which are liable by chemical action with or upon the ink
or color to change their original tint or color I may in such case add to my
preparation an alkaline substance such as ammonium carbonate, or other soluble
carbonate such as potassium carbonate or the like may be employed for this
purpose. I find however ammonium carbonate most rapid, certain, and perfect
in its action.
Having now particularly described and ascertained the nature of my said
invention and in what manner the same is to be performed I declare that what I
claim is:-
1. In the preparation of Docteur or security inks employed for copper or steel
plate printing the particular composition herein described, admixed, compounded,
treated, and coloured by means of Aniline in the way and manner set forth.
2. For the purpose of preventing change of tint in the paper, the combination
and use with the ingredients specified as forming the Docteur ink of Ammonium
or other soluble alkaline carbonate.
T: 041 1807
FRANCIS M. ROGERS,
21 Finsbury Pavement London, E.C. Agent for Applicant