Diazotype elements and processes with carbodiimide dehydrating agents to generator couplers

A light-sensitive, heat-developable diazotype element comprising a light-sensitive diazonium salt, a solid carbodiimide dehydrating agent, and a solid coupler precursor in the form of an aminocarboxylic acid capable of producing a diazo coupler upon dehydration; and the method of using it to produce a visible dye image wherein the element is exposed to actinic radiation and then heated to the melting point of the dehydrating agent or coupler precursor to activate the dehydrating agent, and generate the diazo coupler which in turn reacts with undecomposed (unexposed) areas of the diazonium salt to yield an imagewise dye pattern. Optionally, an alkali precursor may be utilized in the element to accelerate dye formation.