Seasonal summer fruits contaminated with carbide are causing serious health hazards such as stomach pain, acidity, food poisoning, digestive trouble and colon cancer, experts said on Saturday. "Carbide mix hinders biochemical reaction in fruits and subsequently cause the deadly diseases including cancer," Professor ABM Faruque of the Department of Pharmacy of Dhaka University told BSS on Saturday. Prof. Faruque said people could easily identify carbide- contaminated fruits through a small examination on the spot. The contaminated fruits, especially mangoes, can be identified once they found fully yellowed, firm inside and lack of original flavour. The natural fruits on contrary, he said, would be less yellowed, soft inside and full of flavour, which the people can easily understand. A large number of unscrupulous businessmen have been trading the carbide-mixed fruits to reap their personal gains leaving thousands at serious health risk. Prof Faruque said there is no carbide industry in the country as it is being used only in battery companies. But some people are using the chemical as it protects fruits from quick perishing, he said. The pharmacist suggested for enacting a 'Carbide Control Law' which would help check carbide hoarding, selling and wholesaling in the country. Tamanna Hossain, a frequent fruit buyer, told BSS "We have heard about it but can not identify the toxic fruits as those are artificially ripen in a way where differentiation is really difficult for commoners.: She, however, said the government should strengthen its monitoring system to deter the so-called 'traders of poison'.