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The International Slavery Museum in Liverpool is trying to solve a mystery dating back nearly 200 years, and there's a chance that you could help.

Staff are trying to trace the name and story behind a portrait called "The Black Boy" who was painted by a local artist in the 1840's and now hangs in the museum.

Photo: The Black Boy, c.1844, William Lindsay Windus (1822-1907) c. National Museums Liverpool.