Abstract: Disclosed are thermal recording materials including different regions for recording latent and visible images. The thermal recording materials of the present teachings can include a substrate, a base coating containing an electron-accepting compound, and two or more top coatings each containing a different electron-donating compound. Latent images can be formed in exposed regions of the base coating, while visible images can be recorded in different colors in exposed regions of the top coatings. Methods of preparing and using the thermal recording materials also are disclosed.

Abstract: An electrical circuit is provided with a substrate, preferably of synthetic polymer or coated paper, and an electrical circuit letterpress printed onto the substrate from ink comprising of electrical particles suspended in a resin. The resin may be an organic resin such as a soy resin, and the electrical particles may be electrically conductive such as metallic silver. The manufacture of conductors, resistors, capacitors and other electrical components is proposed. The circuit printing process is reliable and comparatively inexpensive and does not suffer from the inherent limitations of other additive printing processes.