July 12, 2007 - ...use of a chemical found in antifreeze in the production of toothpaste. In a report aired Wednesday night, China Central Television showed how a bun maker in a district in Beijing used cardboard picked off the street as filling for his product. The undercover investigation report showed how squares of cardboard were first soaked to a pulp in a plastic basin of caustic soda - a chemical base commonly used in manufacturing paper and soap - then chopped into tiny morsels with a...