Apple cider vinegar rinse lightening hair...

in Hair Type 4
Hi guys. I've been using an apple cider vinegar rinse because I live in an area with hard water. I've noticed that it has started to lighten my hair. 
Has anyone else experienced this? Is there anything I can do to bring my natural hair colour back?

Has anyone else experienced this? Is there anything I can do to bring my natural hair colour back?
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