Process for Producing by either a Gelatine, Intaglio or Surface Printing, Mezzo-tints or Chromo-mezzo Tints on Lithographic Stone or Metal by Means of Transfer.
Year: 1897

page_text: Process for Producing by either a Gelatine, Intaglio, or Surface
Printing, Mezzo-tints or Chromo-mezzo Tints on Lithographic
Stone or Metal by Means of Transfer.
I, RANDOLPH JOHN STURGESS, of 100 and 102, Clerkenwell Road, in the County of
London, E.C., Printer and Publisher, do hereby declare the nature of this inven-
tion to be as follows:-
According to my invention which I term the "lapitype process," I produce either
by a gelatine, intaglio, or surface printing, mezzo-tints on chromo-mezzo tints on
lithographic stone or metal by means of transfer as follows:-
According to one method a sensitised gelatine supported by either glass or metal
is exposed under a negative and treated in the same manner as collotype plates,
80 as to produce a printing surface. It is then treated by a special chemical
process for the production of a natural grain, of which the peculiarity is that it
is fine in the high lights, gradually getting coarser in proportion to the shadows.
According to another method, I produce on either zinc or copper by means of
photography, or line or wash drawing by hand, a picture either in natural or
artificial grain, and from this I obtain transfers by surface printing.
According to another method I produce an intaglio in either grain or line by
means of photography from any photograph print or drawing and employ this as
transfer to stone or metal or for surface printing.
Dated this 7th day of October 1807
Process for Producing by either a Gelatine, Intaglio, or Surface
Printing, Mezzo-tints or Chromo-mezzo Tints on Lithographic
Stone or Metal by Means of Transfer.
I, RANDOLPH JOHN STURGESS, of 100 and 102, Clerkenwell Road, in the County of
London, E.C., Printer and Publisher, do hereby declare the nature of this inven-

page_text: which the peculiarity is, that it is nne in the high nights, gratually geboring
coarser in proportion to the shadows.
A plate is thus quickly prepared for immediate purposes from which a limited
number of transfers are obtained.
The operation is as follows:-
A plate either glass or metal is prepared in the usual manner as for collotype,
with 60 parts of water.
5 parts of gelatine.
Half a part of bi-chromate of potash.
Half a part of bi-chromate of ammonia.
1 part of pure sugar.
It is then dried in a collotype plate oven and exposed under a negative till the
shadows are solid, afterwards it is washed in running water till the high lights
are clear.
It is then put into a solution consisting of water 20 parts, saturated with hypo-
sulphite of soda and 10 parts of common salt. The plate is then washed till grain
appears, and as soon as strong enough further development is stopped by dipping
it into alcohol.
The plate is then dried naturally in a rack, and etched with equal parts of
water and glycerine for 15 minutes.
In addition to above, 1 part of calcium chloride may be added and the plate
dried, exposed for shadows, and washed as directed for high lights, watching for
the grain, and the washing being stopped as soon as the grain is sufficiently deve-
loped, by dipping the plate into alcohol. The plate is then finished by drying and
etching as above.
II. According to a modified method for producing on either zinc, or copper by
means of photography from a line or wash drawing, a picture in either a natural,
or artificial grain, from which transfers can be obtained by surface printing,
giving a grained positive from which negatives can be taken according to require-
ments, I proceed as follows.
A plate ether glass or metal, is prepared in the usual manner as for collotype,
with the following formula.
72 parts of water.
6 parts of gelatine.
1 part of bi-chromate of potash.
1 part pure sugar (coating to be twice the thickness as used for collotype plates).
It is then dried in a collotype plate oven. When dry, it is exposed under a nega-
tive until the shadows are solid. It is then washed in running water for 2 hours,
dried naturally on the rack, and then etched with equal parts of water and glyce-
rine for 15 minutes. It is now dried by dabbing with a damp cloth. It is then
heated again to 68° and finally dusted in with finest graphite, thus producing a
grained positive.
III. According to a modified method for producing an intaglio in either grain
or line by means of photography from any photograph, print, or drawing for
transferring to stone or metal for surface printing, a copper plate is dusted in a
dusting box with finest bitumen, the grain thus obtained is melted by a gentle
heat on to the plate.
A carbon transparency is squeezed on to this plate, and developed in hot water.
When dry it is etched in a 30% to 40 % solution of perchloride of iron until all,

page_text: except the highest lights are touched, and the plate is then finished for pulling
transfers.
Having now particularly described and ascertained
the nature of this
nvention and in what manner the same is to be performed, I declare that what
I claim is:-
1. The herein described method I of producing a plate for transfers.
2. The herein described method II of producing a plate for surface printing.
3. The herein described method III for producing an intaglio plate.
Dated this 7th day of July 1898.
ABEL & IMRAY,
Agents for the Applicant.
ABEL & IMRAY,
Agents for the Applicant.