Kumkum is holding the lot of significance in Indian society. It is either yellow colored kumkum which is made from powdered with a bit of slaked lime or red colored kumkum made from saffron.
Hindu ladies put sindoor in the parting of their hair as well as put is as a round mark so as to wish happy & long life. For this reason widows did not wear Kumkum and it is considered inauspicious.
There are many Hindu males also put kumkum on the forehead depending on the sect they are following:
Generally, Hindus applies red mark on the forehead while visiting a temple or after performing a prayer at home.
You must be amazed that applying Kumkum has the scientific reasons:
The scientific reason for this particular location has to do with the ancient Hindu belief that "the human body is divided into seven vortices of energy, called chakras, beginning at the base of the spine and ending at the top of the head.
It represents our foundation and feeling of being grounded.