have shown that copper was used. After firing the enamel was polished flush with the surrounding metal, which was presumably decorated last. Notes References Jonathan Alexander & Paul Binski (eds), Age of Chivalry, Art in Plantagenet England, 1200–1400, Royal Academy/Weidenfeld & Nicolson, London 1987; most of the best English examples up to 1400 are catalogue numbers 541, 543, 580-587, 608-610 "British Museum Investigation" Investigation of the 'rouge clair' glass on the Royal Gold Cup webpage, accessed June 16, 2010 Campbell, Marian, in Jonathan Alexander & Paul Binski (eds), Age of Chivalry, Art in Plantagenet England, 1200-1400, Royal Academy/Weidenfeld & Nicolson, London 1987 "Maryon (1951)": Maryon, Herbert, New Light on the Royal Gold Cup, The British Museum Quarterly, Vol. 16, No. 2, April 1951, JSTOR "Maryon (1971)": Maryon, Herbert, Metalwork and enamelling: a practical treatise on gold and silversmiths' work and their allied crafts, Courier Dover Publications, 1971, , Osborne, Harold (ed), The Oxford Companion to the Decorative Arts, 1975, OUP, Decorative arts Jewellery making Artistic techniques Vitreous enamel