It can. Your hair will absorb it. Showering can't rinse off what your hair absorbs. I had it happen to me long ago before I had a pool and knew better. I was at the beach swimming in a hotel pool and my blonde hair turned green. At the time, I assumed it was because of chlorine. Now I know better; they must've been using a product that had copper in it. Now, if I travel and swim in a pool, I do NOT get my hair wet.
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