BLACK HAIR DYE FOR MEN PART - 2

In this Hadith, the prohibition of using black hair dye is clearly mentioned.  Thus, we should avoid it and its use is not at all permissible.  

Apart from black hair dye (or any black color), using any other colored hair dye like red or pure Mehndi is permissible.  It is given in Fatawa A'alamgiri, ("Kitab Ul Karahiyya")

Translation:  It is better to dye the hair and the beard, but "Katam" or "Neel" should only be used.

In the Hadith, this is clearly mentioned, as given in (Sunan Abu Dawood, "Babi Fil Khizabi")

Translation of Hadith:  The best dye is Mehndi and "Neel."

However, for a Mujahid, use of black dye is allowed, as given in (Raddul Muhtaar, Vol. 5, Kitabul Khatari wal Ibaha)