We have seen that the priest in the temple often applies sindoor on the idols of Lord Hanuman. There is an interesting story behind it.
According to the legend Sita was applying sindoor to her head. Hanuman Ji saw it and asked the reason behind her act. Sita mata replied that this would ensure a long life for her husband Lord Rama and also he will be happy. Hanumanji then smeared his entire body with sindhoor, in an effort to ensure Rama’s immortality and to make him happy. When Lord Rama saw this he was touched by this gesture and blessed Hanumanji that he will be worshiped for his Bhakti. That is how the tradition of offering Sindoor to Hanuman idol started. It is believed that through this not only Hanuman but Lord Rama also blesses the person who offers sindoor to Hanumanji.