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" TAKE A STRAND TEST:  Snip a small piece of hair from your underlayer and color this first. If only I had, I could have spared myself the brass debacle!  HALF TIME FOR PROCESSED HAIR:  If your locks are already color-treated (like mine), they will absorb new color faster and will need only about half the dyeing time recommended on the box.  HIT THE BLEACH:  Before you buy, check out the highlighting kit&amp;#039;s volume number (you&amp;#039;ll have to open boxes-be sneaky). On the side of most bottles, there is a number before the letter V for &amp;quot;volume,&amp;quot; indicating the potency of the bleach. Select the highest available (30 or 40V); anything lower won&amp;#039;t lift enough and could leave you orange.  LOOK, NO HANDS:  I skipped the protective application gloves but (youch!) don&amp;#039;t recommend it. Think back to chemistry class: Bleach burns.  DAMAGE CONTROL: If you do end up brassy, apply an ashy version of the color you want, then leave on for five to 10 minutes to temper the orange. "^^<http://www.w3.org/2001/XMLSchema#string>
<http://www.marieclaire.com/beauty/how-to/a607/color-hair-help/>