Question 67: It is reported that the Prophet (peace be upon him) said that Wudoo’ (ablution) is not valid if there is paste, nail polish, or mud on the fingers. However, I saw some women putting henna on their hands and feet – and this is a paste – and they perform Salaah (Prayer) with it. Is this permissible, bearing in mind that when they are forbidden to do it they say that it is Taahir (ritually pure)?
Answer: All praise be to Allaah Alone, and peace and blessings be upon His Messenger, and his family and Companions. There is no Hadeeth reported that carries these words, as far as we know. What remains on the hand and feet from henna is just its color, and this does not have any effect on Wudoo’, as this has no thickness as paste, nail polish, or mud do… read more here.