Question Summary:
What is the ruling of applying kohl on Ashura?

Question Detail:

Qazi khan mention that it is recommended to ​apply kohl on Aashoura. What is the stance of our Ulama on this issue?
Jazakumullah khaira

Answer :

In the Name of Allah, the Most Gracious, the Most Merciful.
As-salāmu ‘alaykum wa-rahmatullāhi wa-barakātuh.
The virtue of applying kohl on Ashura is not established by an authentic hadith. 
However, it is mustahab (recommended) to apply kohl on any given day since it was the practice of Rasulullah (salallahu alayhi wa sallam). This virtue is then established because of his' (salallahu alayhi wa sallam) personal practice (sunan al-zawaid) and not because of Ashura.
Consequently, it would be mustahab to apply kohl year-round regardless of the day. [i]
Sohail ibn Arif,
Student Darul Iftaa
Chicago, USA
Checked and Approved by,
Mufti Ebrahim Desai.
 
فتاوى محمودية، ٣/ ٢٧٢ - ٢٧٣ فاروقية [i]