A substantially light-insensitive monosheet thermographic recording material comprising a support and on one side of said support a thermosensitive element, wherein said thermographic recording material contains at least one compound represented by formula (I): ##STR1##

wherein M is hydrogen, an alkali atom or an ammonium group; R¹ is an alkyl, alkenyl-, alkynyl-, thioalkyl-, thioalkenyl- or thioalkynyl-group in which the alkyl-, alkenyl- or alkynyl-group has 6 to 25 carbon atoms; X is —O—, —S— or —N(R²)—; and R² is hydrogen, a —(CH₂)_mSO₃M group or a ##STR2##

group; and m is an integer between 1 and 5.