Jack Black was a rat-catcher and mole destroyer from Battersea, England during the middle of the nineteenth century. Black cut a striking figure in his self-made "uniform" of scarlet topcoat, waistcoat, and breeches, with a huge leather sash inset with cast-iron rats. Black promoted himself as the Queen's official rat-catcher, but he never held a royal warrant.
He is known particularly through Henry Mayhew's account in London Labour and the London Poor, where he tells Mayhew of his work and experiences, including a number of occasions when he nearly died from infection following rat bites.
When he caught any unusually coloured rats, he bred them, to establish new colour varieties. He would sell his home-bred domesticated coloured rats as pets, mainly, as Black observed, "to well-bred young ladies to keep in squirrel cages". Beatrix Potter is believed to have been one of his customers, and she dedicated the book Samuel Whiskers to her rat of the same name. The more sophisticated ladies of court kept their rats in dainty gilded cages, and even Queen Victoria herself kept a rat or two. It was in this way that domesticated—or fancy—rats were established. Black also supplied live rats for rat-baiting in pits, a popular mid-Victorian pastime.