The drug DNP is used to burn fat however it can have side effects such as extreme body temperatures which can lead to brain damage. Aside from dieting, it's also been used as a dye, fungicide, herbicide, insecticide and even as an explosive.
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The pub owner said the sign is a nod at having a bit of fun in support of them and celebrating their relationship and the wedding.
A 61-year-old woman was taken to hospital with head injuries after the incident in Islington, north London.
Assema Kedir Habib spoke at the commemoration of her brother Hashim Kedir and his family.