The Chocolate Scoreboard, coordinated by Australian campaign group Be Slavery Free, ranked 43 companies that purchase over 90 per cent of the world s cocoa, in addition to 29 retailers.
Scientists from the University of Leeds have decoded the physical process that takes place in the mouth, and suggest that where the fat lies helps to make the texture of chocolate so appealing.
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Black chocolate wrappers make consumers think that confectionary will taste more bitter, while yellow and pink create expectations of sweetness, a study found.
Researchers from Brazil asked 420 individuals to predict the taste qualities of slabs of milk and dark chocolate that came presented in different coloured packaging.
They also found that black wrapping made people expect they would enjoy milk chocolate more but that the opposite was true for dark chocolate.
Black chocolate wrappers make consumers think that confectionary will taste more bitter, while yellow and pink create expectations of sweetness, a study found (stock image)
The study was undertaken by food scientist Iuri Baptista of the University of Campinas, São Paulo, and his colleagues.