Electrochromatic coloring system

Details Electrochromatic coloring system Electrochromatic coloring system

B - Operations, Transporting

43

K

B43K 5/00 (2006.01)

Patent

CA 2152546

A coloring system containing an aqueous coloring composition whose coloring effect is changed upon application of an electric current is disclosed. The coloring system comprises a marking instrument containing an aqueous coloring composition whose color may be modified upon application of an electric current; and a source of electric current for modifying the color of said aqueous coloring composition. The aqueous coloring composition may include a PH-sensitive dye or reactants that are oxidized or reduced at an electrode to effect a color change. The electric current may be used either to generate hydroxyl ions, thereby increasing the local pH of the aqueous solution, or to directly oxidize or reduce the reactants of the coloring composition.

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