But if you prefer to play it safe by gradually bleaching your hair (good advice for those with long, dark locks), start with ...

Choose a semi-permanent purple dye then dial down the vibrancy ... It works best on hair that’s pre-bleached platinum, light or medium blonde, just leave on for 30 minutes and rinse.

You see, purple is opposite to yellow on the colour wheel, so it cancels out those yellow or orange hues you get from hard water, UV rays ora bad hair bleach job and cools down the overall tone of ...