It is dangerous to use the Manic Panic Flash Lightning Kit on hair already coloured with permanent black dye. Lightening permanently coloured black hair can be highly damaging to your hair and can cause severe breakage.
Do not attempt without consulting a professional hair stylist who can evaluate the condition of your hair.
If dyed black, some darker Manic Panic shades create great highlights and compliment your hair colour. This includes Vampire Red, for example, and can actually condition and hydrate hair without damaging it.
For natural black hair we recommend using Manic Panic Flash Lightning Bleach Kit in Volume 40 to lighten it.