Using noorah to remove hair
Question

                I have a question: what is noorah? Did the Messenger (peace and blessings of Allaah be upon him) use it? What is the evidence and proof in the Sunnah to that effect?.
Praise be to Allah.Firstly: 
Noorah is 
    composed of calcium and arsenic and was used to remove hair. It would be 
    applied to the place, left for a while then washed off, and the hair would 
    come off with it. See: al-Qamoos al-Fiqhi (1/363) and Zaad 
    al-Ma’aad (4/364). 
Secondly: 
With regard 
    to the Messenger  (peace and blessings of Allaah be upon him) using it, 
    that was narrated in some ahaadeeth, but they are all da’eef (weak) and are 
    not saheeh (sound). 
Ibn Maajah 
    (3751) narrated from Umm Salamah (may Allaah be pleased with her) that the 
    Prophet  (peace and blessings of Allaah be upon him) used to apply 
    noorah (for removing hair). 
This hadeeth 
    was classed as da’eef by al-Busayri in Misbaah al-Zujaajah and by 
    al-Albaani in Da’eef Sunan Ibn Maajah and by Shu’ayb al-Arna’oot in
    Tahqeeq Zaad al-Ma’aad. 
Ibn ‘Asaakir 
    narrated from the hadeeth of Ibn ‘Umar that the Prophet  (peace and 
    blessings of Allaah be upon him) used to apply noorah every month and clip 
    his nails every fifteen days. 
This was 
    classed as da’eef by al-Albaani in Da’eef al-Jaami’ al-Sagheer (no. 
    4536). 
Conclusion: 
    there is no saheeh hadeeth to indicate that the Prophet  (peace and 
    blessings of Allaah be upon him) used it, but there is nothing wrong with 
    using it or using anything else to remove hair, so long as it is not 
    harmful. But shaving is better, because it is mentioned in the Sunnah, and 
    the majority of fuqaha’ are of the view that shaving is better. 
See: 
    al-Mawsoo’ah al-Fiqhiyyah (14/83). 
And Allaah 
    knows best.