Kasavu is a technique used in handlooms of Kerala, with very fine threads of gold or silver used in weave to make border lines and designs on silk and cotton fabrics.
The original kasavu was made by hand using fine golden or silver threads to make border lines or designs on cotton or silk fabrics.
During the Vishu festival, it is customary to place a brand new kasavu cloth near the traditional Vishukkani (lamp) as a symbol of wealth and prosperity.
According to the 'Study and Documenting of Balaramapuram Sarees and Fine Cotton Fabrics', the leaders revolutionized the handloom industry by inviting the saliya/Chaliyan community from Nagercoil in Tamil Nadu and giving them respect and pride within the state.
Though originally from Kerala, over time kasavu has spread across India, especially to the adjoining south Indian states of Tamil Nadu, Karnataka, Andhra Pradesh, and Telangana.