Answered by Ustadh Tabraze Azam.
Question: Assalam ‘aleykum,
I have heard that dyeing hair with non permanent hair dye is not aloud in Islam as it coats the hair. Is it true?
Answer: Wa alaikum assalam wa rahmatullahi wa barakatuh,
I pray that you are in the best of health and faith, insha’Allah.
No, hair dye is not considered to be a preventative barrier, thus it is permitted to use.
Please see: The Fiqh of Hair Dyes
And Allah alone gives success.
Checked & Approved by Shaykh Faraz Rabbani.