Although not recommended your only options will be to bleach/strip your hair or let it grow out. Then your red dye will be visible. Keep in mind that the bleach will dry out your hair!
I have provided a link so that you can read more on the topic:
http://www.indianchild.com/beauty/removing_black_hair_dye.htm
__________________
Please press the "Accept" Button so I receive credit for my work.
.
Bonuses for good work are always welcome!
Thanks for allowing me to help YOU!
