It wasnarrated that 'Uthman bin Mawhab said:
"I entered upon UmmSalamah and she brought out for me a hair of the Messenger of Allah(ﷺ), which was dyed with henna and Katam." (ES)
English reference (ES): Vol. 4, Book 32, Hadith 3623 (ES)
Arabic reference (ES): Book 32, Hadith 3754 (ES)