Curse spells are the most classic form of black magic, and they are generally just a spell to put some bad luck on someone regardless of your reasons or motives.
Boiling water will help you harness your emotional energy into a potent little curse charm.
Get the water boiling on the stove, and toss in the salt (save at least one piece for later). Repeat the following:
Heat and power
This dead flower
By this curse,
I make it worse
Drop in the flower. Repeat the words again, this time saying your victim's name three times at the end. Repeat again.
Watch the water boil and feel your own anger bubbling inside of you. Direct that energy into your spell, and then leave the pot to boil for a few more minutes. Do not let it boil dry! Take the pot off the heat, and pour the hot water into your bottle. Let it cool down and drop in another bit of salt. Seal up the bottle. Repeat the spell words again, including the name of your target.
Keep the bottle somewhere safe until the curse has worked its magick.
A Belladonna Bottle
Herbal magick can be a good source of curse spells, though finding some belladonna may not be that simple because it is poisonous. And yes, this is another bottle spell. I'm just on a roll that way right now.
Light the black candle and watch the flame for a few minutes while the wax starts to melt. Focus your thoughts on your target and why you want to place this curse spell on them.
Put some bits of rust or metal in the bottom of the bottle along with the belladonna, and then drop in the sewing needle.
When the wax has started melting pick up the candle and drip some into the bottle. Try to fill it at least a third full (use a small bottle to keep it simple). It should cover over all the contents to keep it in place, though the sewing needle can still stick out of the wax. Say the words, "Poison you" five times and put the lid on the bottle.
Bury the charm in your yard and it should start to work in a few days.