JPS564672A - Chalk - Google Patents

Chalk

Info

Publication number
JPS564672A
JPS564672A JP7951579A JP7951579A JPS564672A JP S564672 A JPS564672 A JP S564672A JP 7951579 A JP7951579 A JP 7951579A JP 7951579 A JP7951579 A JP 7951579A JP S564672 A JPS564672 A JP S564672A
Authority
JP
Japan
Prior art keywords
fluorescent
chalk
fluorescent substance
solids
letters
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.)
Pending
Application number
JP7951579A
Other languages
Japanese (ja)
Inventor
Hirofumi Nakano
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 JP7951579A priority Critical patent/JPS564672A/en
Publication of JPS564672A publication Critical patent/JPS564672A/en
Pending legal-status Critical Current

Links

Landscapes

  • Inks, Pencil-Leads, Or Crayons (AREA)

Abstract

PURPOSE: To enable letters to be clearly read even when the letters are written with a color chalk and to enable a clear photographic image in photographing to be obtained, by a method wherein a fluorescent substance is incorporated into a chalk.
CONSTITUTION: A fluorescent substance is mixed with a raw material for a chalk such as slaked gypsum. The mixt. is hardened and shaped to a rod or a plate. Examples of the fluorescent substances are fluorescent paints, fluorescent dyes, tungstates, uranyl salts, platinum cyanides, org. solids such as naphthalene, anthracene and inorg. solids such as rare earth salts which effectively emit light at a room temperature. An activator such as manganese, copper may be added to the fluorescent substance.
COPYRIGHT: (C)1981,JPO&Japio
JP7951579A 1979-06-23 1979-06-23 Chalk Pending JPS564672A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP7951579A JPS564672A (en) 1979-06-23 1979-06-23 Chalk

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP7951579A JPS564672A (en) 1979-06-23 1979-06-23 Chalk

Publications (1)

Publication Number Publication Date
JPS564672A true JPS564672A (en) 1981-01-19

Family

ID=13692098

Family Applications (1)

Application Number Title Priority Date Filing Date
JP7951579A Pending JPS564672A (en) 1979-06-23 1979-06-23 Chalk

Country Status (1)

Country Link
JP (1) JPS564672A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS58101781U (en) * 1981-12-29 1983-07-11 中嶋　達郎 chiyoke
JPH0353593U (en) * 1989-09-27 1991-05-23

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS58101781U (en) * 1981-12-29 1983-07-11 中嶋　達郎 chiyoke
JPH0353593U (en) * 1989-09-27 1991-05-23

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