TNT spends decades as a dye and regulatory anomaly

Trinitrotoluene began with Julius Wilbrand's 1863 work on a yellow dye. The staged industrial process converted toluene into TNT and reused sulphuric acid after reconcentration. American adoption also depended on enough chemical capacity to remove xylene and other contaminants from the toluene feedstock, which helped keep Explosive D in service while that capacity developed. The compound spent more than two decades without attracting serious attention as an explosive. Its unusual stability made it possible to melt and pour TNT into shaped fillings once military users recognized its energy. That same apparent inertness left TNT exempt from Britain's 1875 explosives legislation for manufacturing and storage purposes even in 1910. TNT's path into service therefore depended on dye chemistry, purification capacity, ammunition requirements, and regulations that lagged behind military use.