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Black Chelate for Molecular Matrix Printing

IP.com Disclosure Number: IPCOM000041508D
Original Publication Date: 1984-Feb-01
Included in the Prior Art Database: 2005-Feb-02

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Related People

Aviram, A Patel, VV [+details]


Molecular Matrix Printing (MMP) is based on the color formation that occurs when a metal ion encounters a chelating agent, which is part of the electrolyte solution that is used to moisten the paper. The metal ion is provided by anodizing an electrode in contact with the paper. A chemical formulation for providing black printing is described. A variety of color-forming chelating agents have been found, but it is very difficult to form a black color in MMP. The chelating agent 1-pyrrolidinecarbothioic acid ammonium salt will produce a black complex with iron ions. This material is commercially available and is white, odorless, and appears to be nontoxic. The chemical formula is as follows: It can be used in MMP to produce black lettering.