Fine fibre from coconut husk are used to resemble the nervous system of the Idol.
River sand,black sand and gravel sand in equal propertion powdered for a month in concoction of Triphala,gum of Koovalam &plavu.
This mixture is called kalkka.
This kalkka is coated on the idol and also use for ornamentation and decoration.
The vigraha made from Katu-Sarkara-yogam cannot have Avishekam.
Other Idols are used for Avishekam.