HANOI (Reuters) - Vietnamese police have arrested five people suspected of using battery chemicals to dye waste coffee beans, the Ministry of Public Security's online newspaper, Cong An Nhan Dan, said on Tuesday, apparently passing the mixture off as black pepper.
Vietnam is the world's largest exporter of black pepper, accounting for half of global trade. The country is also the world's largest producer of Robusta coffee, which has a bitter taste and is used mainly in instant coffee.
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