i wrote on here before about my dying problem and i was going to dye my hair for the last time 2 weeks later.

Well im goin to dye it again soon but the problem is the last time i dyed it the roots went lighter than the rest of my hair. what do you think could have caused this? and what can i do to prevent it from happenin again?

Also when i dye it again, certain sites have written about colouring hair and they advise to dye it with semi-permanent dye because i usually dye it with permanent dye. SHall i dye my hair with semi-permanant dye or permanent dye for the last time im dyin my hair.
I plan for it to go to a natural looking colour for a long time with me never having to dye it again

*clueless*