Kajal is an eye darkener - a liner, which is applied on the inner eyelids. It is a thick black paste. It has a base of castor oil and hence is cooling to the eyes, apart from enhancing the looks.
This is applied to the new born child too. In order to ensure purity, it is also made at home. The soot from an oil lamp is collected on an inverted basin. This soot is mixed in pure castor oil & pure kajal is ready.
This is applied as a round dot on the chin of a babies, for the black dot is considered to ward off evil.