They cut,dry and sharpen the bamboo and tie the thread around the bamboo to make the kalam.
After 10 days the solution is filtered and the iron filings are taken out. The prepared Kasim kaaram is used for drawing outlines and to fill black color. The tamarind stems are burned and made into charcoal. This charcoal is used for initial sketching.
They squeeze the lemon the remove the extra outline.