Bummer man.If the black is still basecoat the only thing you can do is try to sand it off with something fine like 1000 grit+,but you might need to protect the flames and come back with a quick blend if you sand too far and lighten it or break thru the color.If it's clear right under the flames you can wipe it off with reducer being carefull not to touch the flame basecoat.Come back with more specifics if this doesn't help.