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Scientists from Shanghai Jiao Tong University in China have come up with a unique cotton material that can clean itself when left under ordinary sunlight. The fabric includes a coat of nanoparticles made from a compound of titanium dioxide, nitrogen, silver and iodine. From a test experiment, the special coating was able to remove an orange stain when exposed to sunlight for just two hours. Furthermore, the coating remained intact even after washing and drying.