Excessive levels of fluorescent agents and bleaching chemicals that can cause cancer have been found in paper wrappers used over ice-cream cones made by a Chinese chain. According to test results the wrapper came from the Shanghai Iceason Food Co. Ltd. and was made in April by a paper production firm in the northern city of Tianjin the Shanghai Daily reported. A company official said she could not comment immediately on the test results. Two other companies - Shanghai Qingfangxi Qiye Catering Corp. Ltd. producer of a green tea called Matcha and baking company Shanghai Weiyou Catering Management Corp. Ltd.