One of numerous industries on Red Clay Creek was the manufacture of vulcanized fiber, which was a cotton cellulose treated to form a hard substance used for products from insulators to suitcases. Northern Delaware was the world center for production of this fiber. On a hilltop above the creek, the owner of National Vulcanized Fiber Company built one of Delaware's more exuberant Queen Anne mansions, of shingles and rockfaced stone. One pointed turret stands above a broad porte-cochere; another caps a corner tower that rises rocketlike from a wide porch at its base. In the 1970s, the builder's grandson, Tom Marshall, operated a museum on the property devoted to Stanley Steamers. Marshall has announced that he will leave the beautifully preserved mansion to the state, and it will become a state park.