Using henna does not affect the full ritual bath or the ablution
Machine translationRead the Arabic original
The second question of the fatwa number ( 9637 )
Q 2: Does using henna during menstruation affect the validity of the full ritual bath?
A 2: Praise be to Allah alone, and blessings and peace be upon His Messenger, his family, and his Companions... After that: Using henna does not affect the full ritual bath, nor the ablution; because it has no thickness or density, so it does not prevent water from reaching the skin. However, if
it has a body, it must be removed before the full ritual bath so that it does not prevent the water. And success is from Allah, and may Allah send blessings and peace upon our Prophet Muhammad, his family, and his Companions.
Source
www.alifta.gov.sa
The Arabic text is copied verbatim from the original source, without any edits.