How do I remove black hair dye from long hair?

I tried to lighten my hair but only lightened the roots.! The rest is still black. What should I do?How do I remove black hair dye from long hair?
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http://www.indianchild.com/beauty/removi鈥?/a>How do I remove black hair dye from long hair?
thats because your natural colour at the root accepted the lightner but coloured hair that is darker than the colour you are applying will not it involves stripping the colour and that is something only a proffessional should do good luck