1. Oakeshott, W. 1972.Sigena: Romanesque paintings in Spain and the artists of the Winchester Bible9–10. London The Chapter House of the Convent of Sigena was damaged by ‘appalling fire’ (p.9) in 1936 during the Spanish Civil War. The surviving fragments of wall painting ‘had lost their colour, almost without exception’ (p. 10) and were transferred to the Museum of Catalan Art, Barcelona
2. Casazza, O. 1988.La grande gabbia architettonica di Masaccio, Vol. 16, 96–97. Critica d'arte. figs. 45–47 for documentation of the colour alterations resulting from the fire of 1771
3. Mora, P, Mora, L and Philippot, P. 1984.Conservation of wall paintings67208–209. VIILondon
4. Cennini, Cennino. 1960.The craftman's handbook24–28. 30–32. 34–36. 42New York Theo‐philus. On divers arts, New York (1979) p.23