Explosive Under the Tongue

Explosive Under the Tongue

Alfred Nobel, Nitroglycerin, and the Mercy of a Dangerous Molecule

Before dynamite tamed nitroglycerin, workers sometimes carried the volatile liquid into the mountains for blasting. Image conceived by the author and realized with AI and Photoshop.

Cinema did not invent nitroglycerin’s terror; it inherited it. In Henri-Georges Clouzot’s 1953 masterpiece The Wages of Fear, four desperate men pilot two trucks across a jarring South American landscape of jagged peaks, washed-out roads, and crumbling ledges — though the film itself was shot in France. Their cargo: liquid nitroglycerin in metal cans. Their mission: to haul it across treacherous country and detonate it at a burning wellhead, using the blast to blow the oil-field inferno away from its fuel.

The suspense does not come from a villain’s shadow or a ticking clock. It lives in the silence between heartbeats. Every rut in the dirt is a potential detonation; every tremor carries the possibility of annihilation. Clouzot turns a transport job into an ordeal of almost unbearable tension, lingering on sweat-streaked faces, slowly turning tires, rotting wooden platforms, suffocating dust, and terrain that seems to conspire against the men. Yet their terror is not pure fantasy. It echoes a real and lethal history, when liquid nitroglycerin ranked among the most feared substances of the nineteenth and early twentieth centuries — a compound that could turn a bottle, a wagon, a warehouse, or a careless hand into catastrophe. These men are not merely driving. They are carrying a liquid so unstable it feels almost alive.

Nitroglycerin began, improbably, as a laboratory curiosity. In 1847, the Italian chemist Ascanio Sobrero, working in a Paris laboratory, treated glycerin with a mixture of nitric and sulfuric acids and produced an oily liquid of extraordinary explosive force. Sobrero called it pyroglycerine and quickly learned to fear it. A trace on the tongue gave him a pounding headache; mishandled in larger quantity, it could shatter glassware and destroy flesh. Alarmed by what he had made, Sobrero warned against its practical use. But the molecule had already escaped the caution of its discoverer. It was too powerful, too strange, and too tempting to remain a chemical oddity for long.

Before dynamite, nitroglycerin had already been taken into the mountains in its most frightening form: as a liquid. Known as “blasting oil,” it was poured into drilled holes in rock and set off with a detonator. To railroad builders and miners facing granite, it promised a force far beyond black powder: smaller holes, greater shattering power, faster progress through stubborn stone. But the promise came with terror. The same liquid that could split a mountain could explode in transit, in a warehouse, in a wagon, or in a careless hand.

In 1866, shipments of nitroglycerin produced several catastrophic explosions, including the infamous San Francisco disaster, when a leaking crate arrived at the Wells Fargo office on Montgomery Street and detonated as workers tried to open it, leveling the building and killing more than a dozen people. The danger became so great that some users resorted to making the compound near the work site rather than transporting it, while authorities moved to ban or tightly restrict its shipment.

It was Alfred Nobel, the Swedish chemist and engineer, who took Sobrero’s frightening oil and gave it discipline. Where Sobrero had seen danger, Nobel saw power waiting to be harnessed: power for blasting rock, driving tunnels, and sinking mines. He experimented obsessively, and the work extracted a price. Explosions wrecked his laboratories; in 1864, one blast in Stockholm killed several workers and his younger brother Emil.

Nobel continued anyway. His eventual solution was practical rather than purely chemical. Nitroglycerin could be absorbed into a porous, inert material, making it stable enough to handle and transport without surrendering its force. He patented the result in 1867 and called it dynamite — chemical violence, at last, given a handle. It made him immensely wealthy. Dynamite became indispensable to mining, tunneling, railroad building, quarrying, and the great engineering works of the industrial age, and Nobel built an international explosives empire from the substance Sobrero had feared too dangerous to use.

But fortune did not free him from unease. Nobel understood that his invention had served industry, but also war. In 1888, when his brother Ludvig died, a French newspaper mistakenly published Alfred’s obituary instead, condemning him as the man who had grown rich by giving humanity new means of destruction. The phrase often associated with that moment — “the merchant of death” — wounded him deeply, or at least forced him to imagine how history might remember him.

From that moral reckoning came one of the most remarkable acts of public benefaction in modern history. In his will, Nobel directed that the bulk of his fortune be used to establish prizes for those who had conferred “the greatest benefit to humankind.” The money earned from explosives would be transmuted into honors for physics, chemistry, medicine, literature, and peace. Dynamite had given Nobel his fortune; the Nobel Prizes became his attempt to give that fortune a conscience.

Medicine’s encounter with nitroglycerin began in 1849, through Constantin Hering, a German-born homeopathic physician working in America, who tested it on healthy volunteers and found that it produced headache with remarkable consistency. Because homeopathy followed the doctrine of similia similibus curentur — “like cures like” — Hering reasoned that a substance capable of producing headache might, in small doses, treat headache. He renamed nitroglycerin glonoine or glonoinum and introduced it as a remedy for headache and related vascular symptoms.

But the headache itself contained the more important clue. The pounding, flushing, and sense of vascular pressure suggested that nitroglycerin was doing something to the circulation. That clue led eventually to angina pectoris — the crushing chest pain that comes when heart muscle is starved for blood. In the nineteenth century, physicians had few reliable remedies for angina. They could name the suffering, but they could do little to interrupt it.

The bridge from Hering’s glonoine to modern cardiac medicine came when physicians began to understand that nitroglycerin’s vascular effects could be turned toward the heart. If the drug widened blood vessels in the head, perhaps it could ease the burden on the circulation elsewhere. Given in tiny doses, nitroglycerin could relax the vascular system, reduce the heart’s workload, and relieve the pain of angina with striking speed. The explosive oil of mines and railroads was becoming something almost opposite in medicine: not a force of rupture, but a means of release.

In 1896, as Nobel’s own heart was failing, his physicians prescribed nitroglycerin for his angina — calling it Trinitrin. He wrote to a friend that it was strange to be dosed with nitroglycerin, of all things. He died that December. The violent liquid he had made usable for industry had returned to him, at the end, as medicine.

No other drug has quite so vivid a history. Nitroglycerin entered the public imagination not as medicine, but as the stuff of blasting camps, railroad cuts, mountain tunnels, and sudden obliteration. Yet this same substance, infamous for its power to tear open mountains, found its way into the bedside vial — most famously as a tablet dissolved beneath the tongue for sudden angina, and later as sprays, patches, and ointments — where a few milligrams could ease the crushing pain of a heart starved for blood. Few compounds have traveled so dramatically from terror to therapy, from explosion to relief.