Browse Prior Art Database

IMPROVEMENTS IN ELECTROMARKING MATERIAL

IP.com Disclosure Number: IPCOM000022957D
Original Publication Date: 1976-May-31
Included in the Prior Art Database: 2004-Mar-27

Publishing Venue

Xerox Disclosure Journal

Abstract

The present method of writing in the ioncolor proceâs consists of passing a small current through a porous belt, e.g. cellulose soaked with a conductive solution containing a pH indicator such as phenolphthalein. Passage of the current, with subsequent slight electro~~ lysis of the solution, results in a change in color in the pH indicator due to the formation of OH~and H+ ions, thus forming a visible mark, Problems have been encountered because of leaching of the indicator from the belt due to continual wetting and evaporation. This is the case since most indicators do not bond firmly to cellulose,