Abstract: Black-and-white direct thermographic materials and photothermographic materials can be processed or developed at lower temperatures because of the incorporation of a tertiary sulfonium or quaternary phosphonium salt in an amount of at least 0.5 mol % based on total silver in the material.

Abstract: Direct thermographic materials can be imaged at lower temperatures. These materials include a non-photosensitive, non-halogen-containing organic silver salt and a reducing agent for silver ions. The materials also contain a halogen-containing compound that has at least 2 carbon atoms and is capable of releasing its halogen to form silver halide when heated to a temperature between 60 and 141° C. in the presence of source of silver.

Abstract: Direct thermographic materials are designed to have image tone with near neutral density. Besides a non-photosensitive source of reducible silver ions, the materials also include a color developing agent precursor that releases a color developing agent when heated to a temperature of at least 80° C., and a combination of cyan and magenta dye-forming color couplers that provide cyan and magenta dyes. No black-and-white developers are purposely added to these materials. This combination of components provides a means for controlling image tone without reliance solely upon conventional toning agents that provide imaging toning only.

Abstract: Silver-free, aqueous-based direct thermographic materials are designed to have image tone with near neutral density. Without the use of organic silver salts containing reducible silver ions, the image is formed using a color developing agent precursor that releases a color developing agent when heated to a temperature of at least 80° C., a combination of cyan, yellow and magenta dye-forming color couplers that provide cyan, yellow, and magenta dyes, and a substituted or unsubstituted benzoquinone as an oxidizing agent. No silver metal or silver ions are purposely added to these materials. This combination of components provides a means for controlling image tone without reliance upon conventional toning agents.

Abstract: Silver-free, aqueous-based direct thermographic materials are designed to have image tone with near neutral density. Without the use of organic silver salts containing reducible silver ions, the image is formed using a color developing agent precursor that releases a color developing agent when heated to a temperature of at least 80° C., a combination of cyan, yellow and magenta dye-forming color couplers that provide cyan, yellow, and magenta dyes, and a hindered-amine N-oxyl as an oxidizing agent. No silver metal or silver ions are purposely added to these materials. This combination of components provides a means for controlling image tone without reliance upon conventional toning agents.

Abstract: Direct thermographic materials are designed to have image tone with near neutral density. Besides a non-photosensitive source of reducible silver ions and black-and-white silver ion reducing agent, the materials also include a color developing agent precursor that releases a color developing agent when heated to a temperature of at least 80° C., and a cyan dye-forming color coupler that is capable of reacting with the released color developing agent to produce a cyan dye. Alternatively, the material can have a combination of cyan and magenta dye-forming color couplers. These components provide a means for controlling image tone without reliance solely upon conventional toning agents.

Abstract: Aqueous-based thermally sensitive emulsions and photothermographic imaging materials include photosensitive silver halide grains that comprise at least 15 mol % iodide based on total silver in the grains and are doped with bismuth (+3). These materials have increased photographic speed especially in the infrared region of the electromagnetic spectrum.