Patsy Sherman watched an assistant spill a bottle of her latex mixture over a pair of white tennis shoes in 1953. Nothing would shift the stain, and that was the useful part.
Patsy Sherman had joined 3M the year before with a degree in chemistry and maths. The job was offered to her as temporary, on the assumption that she would leave it when she married.
She and a colleague named Sam Smith had been handed a completely different problem. New jet fuels were eating through the rubber in aircraft fuel lines, and the company wanted a rubber that could survive them.
The assistant was carrying a bottle of synthetic latex that Sherman had mixed. It went over her white canvas shoes.
Water did not shift it and neither did any solvent they tried. Over the following days the splashed patch stayed clean while the rest of the shoe picked up dirt like any other shoe.
A ruined shoe is a ruined shoe. Sherman looked at it and saw a product.
She and Smith spent the next three years turning a failed rubber into a fabric treatment. Scotchgard went on sale in 1956.
During the testing she was kept out of the textile mill, because a rule at the time barred women from the floor. She waited outside while other people carried the results to her.
The two of them ended up holding 13 patents in fluorochemical polymers. Sherman stayed at 3M until 1992, and for forty years she gave the same piece of advice, which was to pay attention when something does not come out the way you expected.
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