GB1221610A - Transitory inks - Google Patents

Transitory inks

Info

Publication number
GB1221610A
GB1221610A GB5424869A GB5424869A GB1221610A GB 1221610 A GB1221610 A GB 1221610A GB 5424869 A GB5424869 A GB 5424869A GB 5424869 A GB5424869 A GB 5424869A GB 1221610 A GB1221610 A GB 1221610A
Authority
GB
United Kingdom
Prior art keywords
indicator
ink
transitory
naoh
water
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
GB5424869A
Inventor
Samuel Irving Friedman
Albert Fredrick Lesher
Charles Hamilton Beadles
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
Publication of GB1221610A publication Critical patent/GB1221610A/en
Expired legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09B—EDUCATIONAL OR DEMONSTRATION APPLIANCES; APPLIANCES FOR TEACHING, OR COMMUNICATING WITH, THE BLIND, DEAF OR MUTE; MODELS; PLANETARIA; GLOBES; MAPS; DIAGRAMS
    • G09B3/00—Manually or mechanically operated teaching appliances working with questions and answers
    • G09B3/02—Manually or mechanically operated teaching appliances working with questions and answers of the type wherein the student is expected to construct an answer to the question which is presented or wherein the machine gives an answer to the question presented by a student
    • G09B3/04—Manually or mechanically operated teaching appliances working with questions and answers of the type wherein the student is expected to construct an answer to the question which is presented or wherein the machine gives an answer to the question presented by a student of chart form
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
    • C09D11/00—Inks
    • C09D11/50—Sympathetic, colour changing or similar inks

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Theoretical Computer Science (AREA)
  • Educational Administration (AREA)
  • Educational Technology (AREA)
  • General Physics & Mathematics (AREA)
  • Business, Economics & Management (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Physics & Mathematics (AREA)
  • Materials Engineering (AREA)
  • Wood Science & Technology (AREA)
  • Organic Chemistry (AREA)
  • Inks, Pencil-Leads, Or Crayons (AREA)
  • Investigating Or Analyzing Non-Biological Materials By The Use Of Chemical Means (AREA)

Abstract

1,221,610. Transitory inks. S. I. FRIEDMAN, A. F. LESHER and C. H. BEADLES. 5 Nov., 1969 [8 Nov., 1968], No. 54248/69. Heading C4A. A writing ink giving a transitory mark which then remains invisible until developed, comprises an ink vehicle and a solution of a pH- responsive chemical indicator which reversibly changes with pH from colourless to coloured, the pH of the ink being within the range in which the indicator is coloured. The indicator may be quinaldine red; ethyl red; p-nitrophenol; m - nitrophenol; 2,4 - dinitrophenol; 2,4,6 - trinitrotoluene; 1,3,5 - trinitrobenzene; 6,8 - dinitro - 2,4 - (lH)quinazolinedione - (mdinitrobenzoylene urea); phenolphthalein; o - cresolphthalein; thymolphthalein; ethylbis - (2,4 - dimethylphenyl) - acetate. The ink vehicle may include glycerine and ethanol or methanol, and/or acetone or carbon tetrachloride. The indicator is dissolved in water or an alcohol-water mixture adjusted to the required pH by means of alkali metal hydroxide, e.g. NaOH. Writing is subsequently exposed by a " revealing solution " which may be water, a base or a weak acid. Examples 1-3 disclose inks consisting of NaOH, glycerine, absolute alcohol, and (1) thymolphthalein, (2) phenolphthalein, (3) o-cresolphthalein, for which a revealing solution may be sodium carbonate or weak aqueous NaOH.
GB5424869A 1968-11-08 1969-11-05 Transitory inks Expired GB1221610A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US77449168A 1968-11-08 1968-11-08

Publications (1)

Publication Number Publication Date
GB1221610A true GB1221610A (en) 1971-02-03

Family

ID=25101415

Family Applications (1)

Application Number Title Priority Date Filing Date
GB5424869A Expired GB1221610A (en) 1968-11-08 1969-11-05 Transitory inks

Country Status (2)

Country Link
DE (1) DE1956143A1 (en)
GB (1) GB1221610A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2007080361A2 (en) 2006-01-07 2007-07-19 Polyseam Limited Composition and method
FR2938266A1 (en) * 2008-11-12 2010-05-14 Ermanno Bo SELF-DEACTING INK BY AUTO EVAPORATION, USEABLE ON PAPER SUPPORT, BY MEANS OF A SPECIFIC PEN, BUT NOT EXCLUSIVELY.

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS54131428A (en) * 1978-04-03 1979-10-12 Adger Kogyo Co Ltd Ink
US4907903A (en) * 1987-08-07 1990-03-13 Kiyoharu Kawashima Representing utensil
JPH0323984A (en) * 1989-06-20 1991-01-31 Seiji Kawashima Printed matter
US5213025A (en) * 1990-01-26 1993-05-25 Thomas Industries Inc. Conical rod piston
US4976591A (en) * 1990-03-02 1990-12-11 Intevep, S.A. Self lubricating, two stage variable compressor
EP0460270B1 (en) * 1990-06-08 1992-08-26 Kiyoharu Kawashima Color changing print
US5498282A (en) * 1992-07-31 1996-03-12 Binney & Smith Inc. Color changing pan paint compositions

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2007080361A2 (en) 2006-01-07 2007-07-19 Polyseam Limited Composition and method
WO2007080361A3 (en) * 2006-01-07 2007-09-07 Polyseam Ltd Composition and method
FR2938266A1 (en) * 2008-11-12 2010-05-14 Ermanno Bo SELF-DEACTING INK BY AUTO EVAPORATION, USEABLE ON PAPER SUPPORT, BY MEANS OF A SPECIFIC PEN, BUT NOT EXCLUSIVELY.
WO2010055226A1 (en) * 2008-11-12 2010-05-20 Ermanno Bo Ink that erases itself by self-evaporation and can be used on a paper medium by means of a specific writing implement

Also Published As

Publication number Publication date
DE1956143A1 (en) 1970-07-02

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