There is nothing wrong with using the black dye that is called dooj, but if the dooj has any substance that prevents the water from reaching the skin, it must be removed when doing ghusl from janaabah or following menses and nifaas, and when doing wudoo’.
And Allaah is the Source of strength. May Allaah send blessings and peace upon our Prophet Muhammad and his family and companions.
Standing Committee for Academic Research and Issuing Fatwas
Shaykh ‘Abd al-‘Azeez ibn Baaz, Shaykh ‘Abd-Allaah ibn Ghadyaan, Shaykh Saalih al-Fawzaan, Shaykh ‘Abd al-‘Azeez Aal al-Shaykh, Shaykh Bakr Abu Zayd