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Sindooram is a traditional red or orange-red colored cosmetic powder from India, usually worn by married women along the parting of their hair.Use of sindoor denotes that a woman is married in many Hindu communities, and ceasing to wear it usually implies widowhood. The main component of modern sindoor is usually vermilion.

Use of sindoor is frequently mentioned in the  puranas, lalita Sahasranama and Soundarya Lahari.
Source:Wikipedia