Ehrlich’s successes with Trypan Red and compound 606 (which he named Salvarsan, from the word salvation) proved that diseases were just pathological locks waiting to be picked by the right molecules. The line of potentially curable illnesses now stretched endlessly before him. Ehrlich called his drugs “magic bullets”—bullets for their capacity to kill and magic for their specificity. It was a phrase with an ancient, alchemic ring that would sound insistently through the future of oncology.
