Hong Kong's Centre for Food Safety said yesterday that its tests revealed two Cadbury products contained the toxic industrial chemical melamine. Of 104 samples tested, Cadbury Dairy Milk Cookies Chocolate bulk pack 5kg, with an expiry date of November 2, 2009, and Cadbury Dairy Milk Hazelnut Chocolate bulk pack 5kg, with an expiry date of January 23, 2010, were found to be contaminated with melamine at 6.9mg per kilogram and 56mg/kg of melamine respectively. The other 102 samples were found to be satisfactory. Under the Harmful Substances in Food (Amendment) Regulation 2008, the legal limit for melamine in these products is 2.5mg/kg. The centre said an infant weighing 10kg would have to eat 77 pieces of the first product per day to exceed the tolerable daily intake, based on criteria provided by the US Food and Drug Administration. But it would only take about nine pieces per day of the second product for a baby of the same weight to consume too much melamine. Cadbury withdrew the two products earlier as part of a recall of 11 products last Monday. The centre said it had since tested eight of the 11 products and the remaining three could not be found on the market. The other products tested were found to be safe. The centre had sent a warning letter to the importer of the products and the government would prosecute if any law was found to have been broken, a centre spokesman said. The discovery of melamine-tainted products came yesterday as 18 government clinics checked 2,132 patients for kidney stones - a symptom of melamine poisoning.