What is the ruling on bathing with henna?

The questioner : Bathing with henna?

The Shaykh : What? Bathing with henna?

The questioner : Yes.

The Shaykh : How does one bathe with henna?

The questioner : ... with henna water

The Shaykh : Who does this?....

The questioner : Some ... do this ... .

The Shaykh : What happens to his body then?

The questioner : Nothing happens.
The student : It becomes colored [the students laugh]

The Shaykh : In any case, if this is intended as an act of worship, it is a religious innovation (bid'ah), and if it is not intended as an act of worship, it is a custom, provided it does not harm him.

The questioner : It is a custom.

The Shaykh : It does not harm.