The only trick: Choose a dye that’s gentle on the hair, tough on grays, and easy to apply. To help whittle down the selection, consider the formulas celebrity hairstylists actually recommend ...

Methods: A retrospective analysis of patch-test results since October 2006 was done and yielded 28 patients allergic to PPD who were also tested with a hair dye series. From January 2004 through ...

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(Avoid using colored bath towels, which could transfer dye onto cashmere.) You’ll also need a gentle soap, such as baby shampoo, or a hand-washing detergent, like our pick, Soak (which doesn’t ...