A massive underground business that has been making fake-branded sauces and flavourings using recycled spices and industrial-grade salt that can be harmful to human health has been uncovered in Tianjin, according to a newspaper investigation. The fake seasonings, sauces, stocks and powdered spices had been sold across the country under well-known domestic and international brand names including Knorr, Nestlé, Lee Kum Kee and Wang Shouyi for more than a decade, The Beijing News reported. Highly toxic hairy crabs may have been hidden, then sold with fake documents: food safety watchdog investigates The workshops – numbering almost 50 – are so well-organised, with surveillance cameras installed outside their building and residents alerting them about any strangers, that local police admitted it was hard to crack down on the illegal business, the report said. About 100 million yuan worth of the fake products are produced each year in the little town of Duliu in the Jinghai area of Tianjin, according to the article. Some producers earn so much money making the fake goods that they drive around in Porsches, it said. Ingredients for the fake food seasonings include tap water and industrial-grade salt, which is banned from human consumption because it can contain cancer-causing agents and heavy metals that damage the liver and kidneys. The producers make the fake-branded food seasonings by buying used spices and herbs such as star anise, pepper and fennel from melon-seed processing factories in nearby Wangkou town, drying the ingredients and grinding them into powder in dilapidated low-rise buildings, the article said. The report said used spices were kept in disused yards at the melon seed factories with rubbish piled nearby. A whistle-blower told the newspaper that workshops producing fake branded chicken stock used a kind of colouring banned in the food industry. The bogus products have the same packaging as their branded counterparts. The counterfeiters copied QR barcodes on genuine products and used them on their own packaging to pass the food off as real. The workshops hire dozens of workers and have formed a complete industrial chain ranging from procurement, processing and delivery, the whistle-blower was quoted as saying. Some businesses had operated for about a decade, the report added. Many workshops have installed surveillance cameras on their walls to warn if their operations were under scrutiny. How China’s food safety scandals are turning Chinese onto healthy diets Reporters from The Beijing News visited the town last week with police officers and anti-counterfeit staff from Wang Shouyi Thirteen Spicery Company, a major Chinese brand for powdered spice products. Several people were nabbed for producing bootleg Wang Shouyi products . Their materials and equipment were also seized. Official were quoted as saying it was difficult to catch the offenders as the goods were produced late in the afternoon or evening and products were moved immediately.