Assalamu alaikum, Shaving is not permissible. As for dying it this is permissible but he has to avoid black colour.

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Assalamu alaikum wa rahmatullahi wa barakatuhu, Perform wudhu with normal water or with sea water or whatever water is available.

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Wa alaikum salam wa rahmatullaahi, They can pray as soon as the time of dhuhur is due. This means if the adhan of thuhur is given everyday at 12:15, they can pray on a Friday at this time.

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