The recipe for the glaze was destroyed, so no other manufacturer could replicate it.Signed on the base by the Ruskin Pottery owner William Howson Taylor and presented to Wilfred Forrester (a thrower at the factory). World famous and highly collectable, Ruskin Pottery was made in Smethwick, West Midlands, between 1898 and 1935. The company exported all over the world, the most notable market being the USA. The flambé glaze, including the stunning red sang de boeuf glaze, is considered to be the best glaze that the factory produced. There was a great deal of secrecy surrounding production of the flambé pieces, which were fired many times at very high temperatures. The flambé pieces were fired in the famous "red kiln". Only a few trusted employees were allowed to supervise the firings and visitors were never allowed to see the kiln.
The recipe for the glaze was destroyed, so no other manufacturer could replicate it.