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Iron buildup -- it's nasty. It coats your hair, lending it a metallic smell and that reddish cast that everyone associates with well water and hard water. Worse yet, it makes your hair feel all brittle, heavy and coarse. It feels even worse on color-treated hair. The damage from chemical services sends an open invitation for the iron to settle in and do what it wants with your hair. If you want to get rid of the build-up, but don't want to lose your color, tread carefully.