In the Name of Allah, the Most Gracious, the Most Merciful.
As-salāmu ‘alaykum wa-rahmatullāhi wa-barakātuh.
It is permissible to dye or bleach one’s hair with any colour except black as long as there are no haram ingredients in the dye. It is permissible to use a colour that looks like black.
It is reported that Hazrat Jābir (Radiyallahu anhu) said: Abu Quhāfah was brought to Rasulullah (Salallāhu Alayhi wa Salam) on the day when Makkah was conquered while his hair and beard were white as thagāmah (name of a white plant)upon that Rasulullah (Sallallāhu Alayhi wa Sallam) said: change this with something else and abstain from the usage of black.[1]
A person who dyes his hair any colour besides pure black may be an Imam on condition that he fulfills other criteria’s of being an Imam.
And Allah Ta’āla Knows Best
Mufti Saeed Ahmed Golaub
Islamic Solutions
Jamaica
References
[1]:79 - (2102) وحَدَّثَنِي أَبُو الطَّاهِرِ، أَخْبَرَنَا عَبْدُ اللهِ بْنُ وَهْبٍ، عَنِ ابْنِ جُرَيْجٍ، عَنْ أَبِي الزُّبَيْرِ، عَنْ جَابِرِ بْنِ عَبْدِ اللهِ، قَالَ: أُتِيَ بِأَبِي قُحَافَةَ يَوْمَ فَتْحِ مَكَّةَ وَرَأْسُهُ وَلِحْيَتُهُ كَالثَّغَامَةِ بَيَاضًا، فَقَالَ رَسُولُ اللهِ صَلَّى اللهُ عَلَيْهِ وَسَلَّمَ: «غَيِّرُوا هَذَا بِشَيْءٍ، وَاجْتَنِبُوا السَّوَادَ» صحيح مسلم (3 / 1663)