SEEING RED WITH WHITE CHOCOLATE

White chocolate contains no cocoa solids, only cocoa butter, sugar, and milk. This could make it more difficult to mask the bitter taste of common poisons like strychnine, which was used in the Christiana Edmunds case. 

Christiana Edmunds, a British murderer, poisoned confectionery she bought from a local shop with strychnine, then returned the laced sweets to be sold to the public.