I don't think 45 minutes would have done that because I do that all of the time. I've a fair amount of grey that is color resistant which requires longer exposure - I always have a great outcome (not so much with a shorter duration) and have never lost hair. I follow the directions carefully for color resistant grey.
Now, your stylist isn't using the same hair color that I do - just wanted to let you know that the time of your exposure probably wasn't the problem



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