his search for raw materials in the 16th and 17th centuries. In: P. *McCray and D. Kingery (eds.), The Prehistory and History of Glassmaking Technology, 167–179. Eramo, G., 2006, The glass-making crucibles of Derrière Sairoche (1699-1714 AD, Ct. Bern, Switzerland): a petrological approach. Journal of Archaeological Science 33, 440–452. Freestone, I., 1992, Theophilus and the composition of medieval glass. In: P. Vandiver er al. (eds.), Materials Issues in Art and Archaeology III, 739–745. Hammersley, G., 1973, The Charcoal Iron Industry and its Fuel. Economic History Review ser 2,26,593–613. Newton, R.G.,1978, Colouring agents used by medieval glass-makers. Glass Technology 19, 59–60. Pollard, A.M., and Heron, C., 1996, Archaeological Chemistry. Royal Society of Chemistry. Rehren, Th., 2000, Rationales in Old World base glass compositions. Journal of Archaeological Science 27, 1225–1234. Schalm, O., Calluwe, D., Wouters, H., Janssens, K., Verhaeghe, F., & Pieters, M., 2004, Chemical composition and deterioration of glass excavated in the 15-16th century fishermen town of Raversijde (Belgium), Spectrochimica Acta Part B 59, 1647-1656. Seibel, F., 2000, The Mandeville Miniature: Correct or Faulty?. In: Annales du 14e Congres de l'Association Internationale pour l'histoire du Verre, 2000, 208–209. Shortland, A., Schachner, L., Freestone, I. and Tite, M., 2006, Natron as a flux in the early vitreous materials industry: sources, beginnings and reasons for decline. Journal of Archaeological Science 33, 521–530. Smedley, J., Jackson, C.M., and Booth, C.A., 1998, Back to the roots: the raw materials, glass recipes and glassmaking practices of Theophilus. In: P. McCray and D. Kingery (eds.), The Prehistory and History of Glassmaking Technology, 145–165. Stern, W.B. and Gerber, Y., 2004. Potassium-Calcium Glass: New data and experiments. Archaeometry 46, 137–156. Tait, H., 1991. Five Thousand Years of Glass. British Museum Press, London. Theophilus, On Divers Arts. Edited and translated (1963) by J.G.Hawthorne and C.S.Smith (Dover Publications, New York) Wedepohl, K.H., 2000, The change in composition of medieval glass types occurring in excavated fragments from Germany. In: Annales du 14e Congres de l'Association Internationale pour l'histoire du Verre, 1998, 253–257. Wedepohl, K.H., 2005. The change in composition of medieval glass types occurring in excavated fragments from Germany. In: Annales du 16e Congres de l'Association Internationale pour l'histoire du Verre, 2003, 203–206. External links History of glass