The unique mirror made of a secret alloy of metals (not glass) is a specialty of the Achari craftsmen of Aranmula in Kerala. The circular mirror is encased in an ornate brass frame which is placed over a two-tier rectangular brass platform. At the bottom of the mirror frame are two incised figures of makara (stylised crocodiles)
According to a legend common among the Acharis of Aranmula, the secret of the alloy was revealed to one Parvathi Amma of the Vishvakarma community in her dream. The Acharis say that the shine on the mirror is on account of use of some powdered herbal leaves.