When they explain to other people what they want to achieve with their start-up, the two young women like to present the image of a chestnut in its thick, green shell. "The best disposable packaging in the world," says Anne Lamp. When the shell has done its job, it falls to the ground and is completely decomposed there by microorganisms.

Anne Lamp, 31, is a process engineer and has developed a bioplastic that can be broken down in any garden compost within two to nine weeks. Together with the psychologist Johanna Baare, 33, she founded the start-up Traceless two years ago - that means without a trace. "With our material, we offer a sustainable alternative to conventional plastic," says Johanna Baare.

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