Bleach; In order to go from dark to light to you need to bleach your hair. It strips color pigmnts from your hair leaving it blonde/etc. So you'll need to use a bleach to go lighter. If you want to avoid th damage use a weak developer. Try using Loreal's quick blue powder bleach with a 10 or 20 vol developer. Also deep condition after doing it and leave your hair unwashed for a few weeks, so that it will let your hair get back to health. Dye; Dye adds pigments to your hair, changing the color. If you apply a blonde dye to your dark hair, you'll end up with blonde/orange roots and a nasty uneven color throughout your hair. You'll never achieve a blonde color, just a horrible uneven mess that you'll nd up having to pay hundreeds of dollars at a salon to get fixed. So, no, the dye won't work. You do need to bleach it. And I'd recommend going to a salon.It'll be worth it in the end.