Sindoor or Sindooram is a traditional vermilion red or orange-red colored cosmetic powder from India, usually worn by married women along the part of their hair. In Hindu communities the use of sindoor indicates a woman is married and ceasing to wear it usually implies widowhood.
If you notice any Hanuman idol, you will first see that he is completely smeared in Vermilon or Sindoor. There is an interesting story behind it.
Wearing Hanuman Sindhur is auspicious it is also called as Ganga Sindhuram. Perform pooja with Hanuman sindhur and wear on forehead, it gives more benefits. Important thing in wearing this sindur is galidhuli bugs, Evil haunting will be destroyed.
When Lord Hanuman saw Sita wearing Sindoor on her head, he asked the reason. Sita replied that she wearing it for the long life and well being of Lord Shri Rama, her husband. Hanuman, as the biggest devotee of Rama thought if a pinch of sindoor on the head can increase the longevity of Lord Rama then why not to apply on the entire body. He then applied sindoor all over his body for Lord Shri Rama’s long life. Seeing this innocence and unmatched devotion of Hanuman, Lord Rama blessings him that whenever the name of devotion takes place, Hanuman’s name will be taken first. Also, whoever will pay respect to Hanuman on Tuesday, not only will his/her wishes come true but will also be dear to Lord Rama himself.