US1217076A - Safety-paper. - Google Patents

Safety-paper. Download PDF

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Publication number
US1217076A
US1217076A US7450016A US7450016A US1217076A US 1217076 A US1217076 A US 1217076A US 7450016 A US7450016 A US 7450016A US 7450016 A US7450016 A US 7450016A US 1217076 A US1217076 A US 1217076A
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US
United States
Prior art keywords
paper
ink
safety
gall
color
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
US7450016A
Inventor
Ernest Emil Schmidt
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Individual
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Individual
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Publication date
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Priority to US7450016A priority Critical patent/US1217076A/en
Application granted granted Critical
Publication of US1217076A publication Critical patent/US1217076A/en
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Expired - Lifetime legal-status Critical Current

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Classifications

    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H21/00—Non-fibrous material added to the pulp, characterised by its function, form or properties; Paper-impregnating or coating material, characterised by its function, form or properties
    • D21H21/14—Non-fibrous material added to the pulp, characterised by its function, form or properties; Paper-impregnating or coating material, characterised by its function, form or properties characterised by function or properties in or on the paper
    • D21H21/40—Agents facilitating proof of genuineness or preventing fraudulent alteration, e.g. for security paper
    • D21H21/44—Latent security elements, i.e. detectable or becoming apparent only by use of special verification or tampering devices or methods
    • D21H21/46—Elements suited for chemical verification or impeding chemical tampering, e.g. by use of eradicators

Definitions

  • This invention relates to paper used for checks, notes, wills, deeds, etc., and has for its ob ect to prevent successful fraudulent alteration of matter written on such paper with commercial fluid writing ink.
  • I impregnate the paper, or the pulp from which it is made, with an agent adapted to chemically combine with the essential ingredients of commercial writ ing ink in rendering matter written with said ink indelible either by the acid and alkaline solutions usually employed to remove commercial ink from paper, or by the abrasive action of a mechanical eraser.
  • Any ordinary writing paper impregnated with said solution becomes very sensitive to commercial writing inks, all of which contain tannate of iron or other similar preparation of iron, in quantity suflicient to make the written matter legible, and also contain nut gall and tannin.
  • the ink a t once combines with the said agent and is rendered practically indelible, so that it cannot be successfully removed without detection, either by means of chemical ink eradicators or by mechanical abrasion.
  • the ex gall incorporated in the paper has the effect of causing fluid ink to penetrate or sink into the paper to such an extent as to materially increase the difficulty of successfully removing the ink from the paper by a mechanical eraser or other abrading instrumentality.
  • the magnesium sulfate hardens the paper and prevents the ink from creeping laterally at the surface of the paper, and thus blurring the written lines.
  • the dye may be applied only to the external surface of the paper, so that the color of the surface contrasts with that of the body of the paper. Mechanical erasure therefore removes the surface color and ex poses a patch of contrasting color. If now an attempt is made to again color the ex posed patch, any coloring matter used will so combine with the chemical agent in the paper as to produce a different color from a... Manama, .i i in.

Landscapes

  • Sanitary Thin Papers (AREA)

Description

UNITED STATES PATENT OFFICE.
ERNEST EMIL SCHMIDT, OF COVINGTON, KENTUCKY.
SAFETY-PAPER.
No Drawing.
To all whom it may concern:
Be it known that I, ERNEST EMIL SCHMIDT, a citizen of the United States, residing at Covington, in the county of Kenton and State of Kentucky, have invented new and useful Improvements in Safety- Paper, of which the following is a specification.
This invention relates to paper used for checks, notes, wills, deeds, etc., and has for its ob ect to prevent successful fraudulent alteration of matter written on such paper with commercial fluid writing ink.
For this purpose I impregnate the paper, or the pulp from which it is made, with an agent adapted to chemically combine with the essential ingredients of commercial writ ing ink in rendering matter written with said ink indelible either by the acid and alkaline solutions usually employed to remove commercial ink from paper, or by the abrasive action of a mechanical eraser.
I have used with satisfactory results an agent composed of a solution of ferrdcyanid of potassium, or its chemical equivalent, viz., ferro-cyanid of sodium, or; gall, magnesium sulfate, and water, using by preference the following proportions:
Ferro-cyanid of potassium (or ferrocyanid of sodium), two pounds,
Ox gall, three ounces,
Magnesium sulfate, one ounce,
Water, four gallons.
Any ordinary writing paper impregnated with said solution becomes very sensitive to commercial writing inks, all of which contain tannate of iron or other similar preparation of iron, in quantity suflicient to make the written matter legible, and also contain nut gall and tannin. The ink a t once combines with the said agent and is rendered practically indelible, so that it cannot be successfully removed without detection, either by means of chemical ink eradicators or by mechanical abrasion.
In eradicating commercial -writing ink. two liquid solutions are applied successively or alternately to the paper, one being acid and, the other alkaline. Either of said 2-'()llltions alone is not capable of removing' the ink without leaving evidence of fraud, but
the two solutions used successively are capable of entirely removing any commercial ink from ordinary paper.
Specification 01' Letters Patent.
the desired tint or color.
Patented Feb. 20, 1917.
Application filed January 26, 1916. Serial No. 74,500.
When paper treated in accordance with my invention has been Written upon with any ink and an attempt is made to remove cating the ink, the acid immediatelysetsthe ink by combining with the iron and tannin of the ink and with the'ferro-cyanid of potassium (or sodium) in the paper, forming ferro-cyanid of'iron, which is insoluble in all acids and alkalis, and is therefore indelible, and cannot be removed without destruction of the paper. 7
If an alkali is first used, it will similarly set the ink and render it indelible.
In either case the chemicalaction is such that evidence of fraud is plainly visible on the paper.
The ex gall incorporated in the paper has the effect of causing fluid ink to penetrate or sink into the paper to such an extent as to materially increase the difficulty of successfully removing the ink from the paper by a mechanical eraser or other abrading instrumentality.
The magnesium sulfate hardens the paper and prevents the ink from creeping laterally at the surface of the paper, and thus blurring the written lines.
To further guard against fraud, I provide the paper with coloring matter, preferably by adding anilin dye to the solution above described, in sufficient quantity to impart The anilin dye combines with any ink-cradieating chemical that may be applied to the paper, the result being a strongly contrasting color wherever the eradicator touches the paper, entirely defeating the fraudulent ntent.
The dye may be applied only to the external surface of the paper, so that the color of the surface contrasts with that of the body of the paper. Mechanical erasure therefore removes the surface color and ex poses a patch of contrasting color. If now an attempt is made to again color the ex posed patch, any coloring matter used will so combine with the chemical agent in the paper as to produce a different color from a... Manama, .i i in.
If White paper is specified equivalent, ox gall, and magnesium sulfate.
6. Safety paper impregnated with a solution of ferro-cyanid of potassium or its specified equivalent, ox gall, and magnesium 2 sulfate, the paper being treated with color; ing matter which is changeable by acid and alkaline ink eradicators.
7. Safety paper impregnated with a s0- lution of ferro-cyanid of potassium or its 25 specified equivalent, ox gall, magnesium sulfate, and anilin coloring matter.
In testimony whereof I have aflixed my signature.
ERNEST EMIL SCHMIDT.
US7450016A 1916-01-26 1916-01-26 Safety-paper. Expired - Lifetime US1217076A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
US7450016A US1217076A (en) 1916-01-26 1916-01-26 Safety-paper.

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US7450016A US1217076A (en) 1916-01-26 1916-01-26 Safety-paper.

Publications (1)

Publication Number Publication Date
US1217076A true US1217076A (en) 1917-02-20

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Family Applications (1)

Application Number Title Priority Date Filing Date
US7450016A Expired - Lifetime US1217076A (en) 1916-01-26 1916-01-26 Safety-paper.

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6159585A (en) * 1997-03-14 2000-12-12 Georgia-Pacific Corporation Security paper

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6159585A (en) * 1997-03-14 2000-12-12 Georgia-Pacific Corporation Security paper

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