From the archive record
Masks are classified as Raksha , Kolam and Sanni. All the three varieties are used for dancing and decorative purposes. Raksha Masks are often seen in processions and festivals. The Kolam Masks are utilised for staging comic plays depicting ancing stories. Sanni Masks are made use of in devil dancing ceremonies to cure illnesses. In fact there are about twenty four kinds of Rakshas known by different names such as Naga Rakshas, Gurulu Raksha, Maru Raksha etc. Masks are turned out from the timber of a tree locally known as "Kaduru". This tree grows in marshy lands bordering paddy fields. Its stem is covered with a bark which sheds amilky liquid like latex. Its wood is soft and easy to cut. When dry it is very light and resembles "Balsa" The English term of this variety is NUX Vomica. Source