Narrated Muhammad bin Seereen
I asked Anas, "Did the Prophet (ﷺ) dye his hair?" Anas replied, "The Prophet (ﷺ) did not have except a few grey hairs."
Narrated Thabit
Anas was asked whether the Prophet (ﷺ) used a a hair dye or not. He replied, "The Prophet (ﷺ) did not have enough grey hair to dye, (such that) if I wanted to count the fading hairs in his beard (I could have)."
Narrated IsraiI
`Uthman bin `Abdullah bin Mauhab said, "My people sent me with a bowl of water to Um Salama." Isra'il approximated three fingers ('indicating the small size of the container in which there was some hair of the Prophet. `Uthman added, "If any person suffered from evil eye or some other disease, he would send a vessel (containing water) to Um Salama. I looked into the container (that held the hair of the Prophet) and saw a few red hairs in it,"
Narrated `Uthman bin `Abdullah bin Mauhab
I went to Um Salama and she brought out for us some of the dyed hair of the Prophet.