The combination of the Rockingham glaze and the red clay was and still is fundamental to the success of the Brown Betty, prolonging the life of the object for its owner and, subsequently, through history.The Staffordshire clay used to make a Brown Betty was first refined in 1693 by Dutch brothers John Philip Elers and David Elers. The brothers emulated the fashionable and expensive Yixing teapots which had originally been imported from China by the Dutch East India Company. The refinement of the local red clay gave rise to a new era of technological experiment in Staffordshire, becoming a catalyst for the industrialisation of the six towns that now make up Stoke-on-Trent.