Ruling on using “shoudher”
Question

                Is it permissible to use the shoudher? Shoudher is a substance that is to be rubbed on hands after using henna in order to make the henna colour black.
Praise be to Allah.
    The Sunnah indicates that it is prescribed for women to dye 
    their hands with henna, and the scholars stated that it is mustahabb, and 
    that not doing it is makrooh, and there is nothing wrong with adding 
    “shoudher” to it. 

    And Allaah is the Source of strength. May Allaah send 
    blessings and peace upon our Prophet Muhammad and his family and companions. 
    End quote. 

    Standing Committee for Academic Research and Issuing Fatwas