(57) A black and white monosheet thermographic recording material comprising a support
and a thermosensitive element, the thermosensitive element containing a substantially
light-insensitive organic silver salt, an organic reducing agent therefor in thermal
working relationship therewith, a binder and at least one toning agent, characterized
in that the at least one toning agent is represented by formula (I):
wherein R1 is a hydrogen atom or an alkyl, an alkenyl, an alkynyl, a cycloalkyl, an alkaryl,
an aryl, a heterocyclic or a heteroaryl group all of which may be optionally substituted;
with the proviso that R1 may not be a hydrogen atom if both R2 and R3 are both hydrogen atoms; R2 and R3 are independently a hydrogen or a halogen atom or an amino, amide, ester, carboxy,
carbonato, alkyl, alkenyl, alkynyl, cycloalkyl, alkaryl, aryl, heterocyclic or heteroaryl
group all of which may be optionally substituted; R2 and R3 may together represent the atoms necessary to complete a heteroaromatic ring with
no more than one nitrogen atom, an alicyclic or a heterocyclic group which all may
be optionally substituted; and X is a carbonyl group, or is -N-R4, where R4 is an alkyl group. The element may also contain a photosensitive silver halide.
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