I don't think you can do that. The colour of the candle is extremely important when casting a spell. Red candles are used for lust and the sort and painting the candle black won't do anything, because the content and the nature of the candle is still red, it simply has a black cover on it. Also, I highly discourage you to use this spell, as it is extremely dangerous and keep in mind that it WILL come back to you and three times as hard. This is the way the universe works and it's stated in the Wiccan Rede. Good luck and blessed be.
I will not use this spell if the thieves return my stolen iPhone, but instead returning it theyre trying to play me. I have no choice but to give them lessons as these 4 thieves still family, and they are professional thieves. I will try to use the white then and see the results, thanks guys