In 1935, Percy Julian stood in his laboratory at DePauw University, staring at a beaker of clear liquid. For months, he had been trying to synthesise physostigmine, a drug used to treat glaucoma, from the calabar bean. His colleagues had told him it was impossible, but Julian was not one to give up easily. As he added the final reagent, the solution turned a deep red—the colour he had been waiting for. He had just become the first person to synthesise a natural product from a plant in a laboratory.

But instead of celebration, Julian faced a wall of silence. The university refused to promote him, not because of his work, but because of the colour of his skin. Percy Julian was born in 1899 in Montgomery, Alabama, a time when segregation was law. His father was a railway clerk, and his mother a schoolteacher. Despite the constant humiliations of Jim Crow, they instilled in him a fierce belief in education. Julian graduated as valedictorian from his high school, but when he applied to the University of Alabama, he was told that Black students were not allowed.

Instead, he attended DePauw University in Indiana, where he worked as a waiter and slept in the attic of a fraternity house. He graduated as class valedictorian again, but the same prejudice followed him: no graduate school in the United States would accept him as a teaching assistant because of his race. Julian eventually earned his PhD from the University of Vienna, where he was treated with respect. When he returned to the United States, he hoped things would be different. He took a position at DePauw, but even after his breakthrough with physostigmine, the university refused to make him a full professor.

Julian graduated as valedictorian from his high school, but when he applied to the University of Alabama, he was told that Black students were not allowed.

In 1936, frustrated and angry, Julian left academia for industry. He joined the Glidden Company, a paint and varnish manufacturer, where he was put in charge of the soybean research division. It was a risky move—few Black scientists worked in corporate America—but Julian saw it as a chance to prove his worth on his own terms. At Glidden, Julian faced a new challenge: he was assigned a small, poorly equipped lab and given little support. But he turned this into an opportunity. He began experimenting with soybeans, a crop that was abundant but underutilised.

In 1940, he developed a method to isolate soy protein, which could be used to make a fire-fighting foam called Aer-O-Foam. During World War II, this foam saved countless lives by smothering oil fires on ships and in factories. Julian also found a way to synthesise progesterone and testosterone from soy sterols, making hormones affordable for millions of people. His work transformed the soybean from a humble bean into a chemical powerhouse. Despite his success, Julian faced constant racism. When he moved his family to Oak Park, Illinois, a white neighbourhood, his house was firebombed.

The local residents petitioned to force him out, and his children were taunted at school. Julian refused to leave. He stood on his front lawn with a shotgun, protecting his home. He also used his influence to fight for civil rights, donating money to the NAACP and speaking out against segregation. His resilience was not just personal; it was a deliberate act of defiance against a system that wanted him to fail. Julian's later years were marked by both triumph and reflection. He received numerous awards, including election to the National Academy of Sciences—only the second Black scientist to be so honoured.

But he never forgot the barriers he had faced. In a speech, he said, 'I have had one goal: to be a first-class scientist. I have never wanted to be a first-class Negro scientist.' He understood that his achievements were not just his own; they paved the way for others. One concrete detail that captures his spirit: he kept a small vial of the first synthetic physostigmine on his desk for the rest of his life, a reminder of what he could accomplish when he refused to give up.

Percy Julian's impact extends far beyond his own discoveries. He held over 130 patents, and his work on soy protein led to the development of synthetic steroids, which are used in everything from birth control pills to anti-inflammatory drugs. By breaking racial barriers in the chemical industry, he inspired generations of scientists from underrepresented backgrounds. His story is a testament to the power of perseverance in the face of injustice. Today, a statue of Julian stands at DePauw University, and his childhood home in Montgomery is a National Historic Landmark—a fitting tribute to a man who turned obstacles into opportunities and changed the world from his laboratory.