GB437969A - Improvements in and relating to security paper - Google Patents

Improvements in and relating to security paper

Info

Publication number
GB437969A
GB437969A GB1440134A GB1440134A GB437969A GB 437969 A GB437969 A GB 437969A GB 1440134 A GB1440134 A GB 1440134A GB 1440134 A GB1440134 A GB 1440134A GB 437969 A GB437969 A GB 437969A
Authority
GB
United Kingdom
Prior art keywords
manganese
paper
iron
zinc
lead
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
Application number
GB1440134A
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
Original Assignee
Individual
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Individual filed Critical Individual
Priority to GB1440134A priority Critical patent/GB437969A/en
Publication of GB437969A publication Critical patent/GB437969A/en
Expired legal-status Critical Current

Links

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

Landscapes

  • Paper (AREA)

Abstract

437,969. Security paper. RUSSELL, D., Rothes, Markinch, Fifeshire. May 12, 1934, No. 14401. [Class 96] Finely divided reactive metal, metal oxide, or both is or are distributed throughout, or in the upper part of safety paper which may also contain other security chemicals. As metals may be used up to 5 per cent of iron, manganese, copper, silver, zinc, mercury, tin, lead, antimony, bismuth, chromium, cobalt, nickel, cadmium, or iron-manganese alloys. The oxides may be of iron, copper, or nickel ; and the other security chemicals, which may be applied to the paper by spraying &c. may be ferrocyanides of manganese, lead, or zinc, zinc sulphide, lithopone or ultramarine, lead carbonate, &c. The metals, metal oxides &c. may be added to pulp in the beating-engine or immediately prior to deposition on the wirecloth of a paper-making machine. The pH value during and after such addition should be not less than 6À7, or with rosin sizing, not above 7À0. In an example, finely powdered iron is violently agitated with water, and added to pulp flowing on to the wire-cloth, size, sodium ferrocyanide, and manganese sulphate being added subsequently, manganese ferrocyanide being precipitated.
GB1440134A 1934-05-12 1934-05-12 Improvements in and relating to security paper Expired GB437969A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB1440134A GB437969A (en) 1934-05-12 1934-05-12 Improvements in and relating to security paper

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB1440134A GB437969A (en) 1934-05-12 1934-05-12 Improvements in and relating to security paper

Publications (1)

Publication Number Publication Date
GB437969A true GB437969A (en) 1935-11-08

Family

ID=10040531

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1440134A Expired GB437969A (en) 1934-05-12 1934-05-12 Improvements in and relating to security paper

Country Status (1)

Country Link
GB (1) GB437969A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9464385B2 (en) 2003-10-15 2016-10-11 Arjowiggins Security Multi-layer security paper

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9464385B2 (en) 2003-10-15 2016-10-11 Arjowiggins Security Multi-layer security paper

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