Writing and/or drawing system comprising ph sensitive dye and method thereof
AssigneeSanko Tekstil Isletmeleri San. Ve Tic. A.S.
InventorsGokhan KAPLAN, Gozde OKTEM, Ertug ERKUS
Life of this patent
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Abstract
The invention refers to a writing and/or drawing system comprising a pH sensitive dye and a writing material having a pH configured to provide a change in the colour of said dye on said surface of the support, as well as to a method to write and/or draw on the system with the writing material.
Claims18
1) A writing and/or drawing system comprising a support having a surface and a device that includes a writing and/or drawing material suitable to write and/or draw on said support, characterised in that said support comprises a dye, said dye being pH-sensitive, whereby the colour of said dye is modified by a change of the pH on said support;
- said writing and/or drawing material having a pH configured to provide a change in the colour of said dye on said surface of the support.
5) The writing system according to any previous claim, wherein said support is one of a canvas, notepad, billboard and publicity poster.
7) The writing system according to any previous claim, wherein said dye is selected from:
- 1-(2-pyridylazo)-2-naphtol (PAN);
- Alizarin Red S (3,4-Dihydroxy-9,10-dioxo-2-anthracenesulfonic acid sodium salt);
- Bromocresol green (3′,3″,5′,5″-Tetrabromo-m-cresolsulfonephthalein);
- Bromocresol purple (5,5′-Dibromo-o-cresolsulfonephthalein);
- Bromophenol blue (3′,3″-Dibromothymolsulfonephthalein);
- Indigo Carmine GR (Indigo-5,5′-disulfonic acid disodium salt);
- Methyl Blue (Aniline blue water soluble);
- Thymol Blue (Thymolsulfonphthalein);
- and mixtures thereof.
11) A writing and/or drawing support having a surface, characterised in that said support comprises a dye, said dye being pH-sensitive, whereby the colour of said dye is modified by a change of the pH on said support.
13) A method for writing and/or drawing on a support comprising the following steps:
- a) providing a support having a surface and a writing and/or drawing material suitable to write and/or draw on said support, applying a dye to said support;
- b) applying said writing and/or drawing material to said support, whereby a writing and/or drawing on said support is obtained;
- characterized in that the support comprises a dye, said dye being pH-sensitive, whereby the colour of said dye is modified by a change of the pH on said support;
- said writing and/or drawing material having a pH configured to provide a change in the colour of said dye on said surface of the support.
Dependencies are inferred from the claim text.