Minnesota Mining and Manufacturing Company

Donald D Buerkley

Norman P Sweeny

Richard S Law

Daniel N Vivona

Color-forming precursor compositions comprising a metal-complexing compound having a plurality of ligand groups and color-activating compositions comprising transition metal salts of oleophilic, organic acids are combined to form dark, permanent images on substrates. The methods and compositions are particularly useful for providing permanent fingerprints and other dermographs.

Imaging compositions and methods

The disclosed moldable compositions contain a metal salt which is a coreactant for, preferably, one of the conventional iron/polyhydric phenol image-forming reactions. The metal salt is dissolved in a liquid plasticizer, and the liquid plasticizer is blended with solid waxes to form a solid, substantially non-toxic, non-hygroscopic, moldable waxy material which is non-softening under normal conditions but which can easily be shaped, hot-melt coated, or the like at temperatures above 60.degree. C. The composition is useful for making wax imaging crayons and sheet-like dispensing means for the metal salt imaging chemical.

Growing community of inventors

Inver Grove Heights, MN, United States of America

Donald D Buerkley