1. Matthews, J.M.Applications of Dyestuffs to Textiles Paper, Leather and the Materials. Wiley, New York. 1920. p 168.
2. Gerber, F.H. “Cochineal and the Insect Dyes,” Ormand Beach, Florida.
3. Nobuko Kajitani, Textile Conservation Department, Metropolitan Museum of Art, New York, provided the samples of dyed wool and described sample preparation.
4. Purinton, N. “SEM Analysis of Paper Before and After Deacidification with Mg(CO3)2,”Tenth Conference on Conservation Training Programs, May 2–4, 1984. Center for Conservation and Technical Studies, Harvard Univ. Art Museum, Cambridge, MA.