Is Apple Cider Vinegar Safe for Colored Hair?

Back when we wrote about using apple cider vinegar as part of a regimen for training your hair to be less greasy, one commenter had a very astute question: Is apple cider vinegar safe for color-treated hair? It's a known remedy for when you're feeling sick, but based on experience, it burns like crazy when you toss it down the ol' hatch, so it seems unlikely that our precious bleached and dyed strands would be able to tolerate the acidity. This would be a shame, though, since ACV has the ability to balance your hair and scalp's pH, cleanse the scalp, smooth the cuticle, and add shine. But because we’re never ones to deliver advice based on mere supposition, we turned to the experts.