Repel evil and return to sender candle spell
Typically candles that are sold specifically for this job of "reverse evil/negativity" they are black and red. This is what you can do if you can only get a hold of solid colors that are commonly sold at most candle stores. You can also use one black and one red candle to replace the double action repel and return candles.
1 black candle (or 1 black and 1 red)
1 mirror plate, any shape will do
Salt
Anointing oil or a carrier oil if you don't have any anointing oils
A needle or pen to carve words into your candle
I used the phrases "return to sender" "repel all evil" "repel all negativity" "protection from all evil" and other such phrases to engrave on my candle. I used both English and Runes to do this. Only use Runes if you are fully comfortable doing so. You don't need to use them for this to be effective. Make sure the engravings are fairly deep, not just light scratches on the candle, you want to get your point across.
After you candle is engraved then cover it with the anointing oil. Then take salt and rub it on the oil dressed candle, making sure to get salt into the words on your candle. Oh and just to let you know how I engraved my candle, I did it vertically so the words were up and down rather than horizontally. I felt this more suited the candle but it's all about what makes sense to you and what you're comfortable with.
Place your candle on your altar, hoodoo altar, or sacred space, or simply a place where you can let the candle burn for a while and not have it be disturbed.
Place the candle on top of the mirror plate and then surround the candle with a ring of salt (on the mirror.)
If you need to incorporate any chants or anything extra here, do so. Then light your candle.
Try to burn your candle for an odd number of days, 7 or 9 would be most effective but do make sure that you burn the candle until it's gone or won't light anymore because there isn't enough wax to keep it going.
Whenever you need to stop your candle from burning either pinch it out with your fingers or snuff it out, DO NOT BLOW IT OUT!
Check up on your candle as it's burning and write down anything unusual that happens. Did your candle go out for some reason? Did you have a hard time getting it to light? Or will it light at all? There could be reasons why you're having problems, those typically aren't a good sign and you may have to burn yet another candle dressed in the same way after the first one is done.