The color of magic isn’t a type of magic but rather the nature of that sort of magic, and is used as a helpful tool to aid the practitioner in organizing the various areas of practice. There are magics perceived as evil, but those can be simply misunderstood forms of magic that deal with a different area. There is no truly good or evil magic, but rather the intentions of the practitioner that determine it’s polarity. True magic is like nature both loving and cruel, but neither is seen as evil. Some forms of “black magic” have some of the same goals as “white magic” but achieved in a different way. That doesn’t constitute it to be evil.
The Dark Arts have been given a bad reputation mostly because of its name. Most people infer “Dark” to mean evil and unholy. This is a big misconception, black magic relies primarily on the powers of the Moon, stars, and entities of the night such as passion, dreams, and winds. Black Magic is used best with those who are passionate and faithful in their cause. The more determined a person is the better the result.
Many ask what the difference between White and Black Magic is. White Magic is more subtle and is powered through the Sun and entities of the day. Both can bring drastic changes in ones life, but many earlier Black practitioners were persecuted regardless that their craft was positive and not harming anyone. Saying it was the work of the devil is simply untrue. Due to these accusations finding a reputable caster is now extremely difficult, as earlier generations of casters practiced in secret with great risks.
Black Magic is just another form of magic, but it deals with darker aspects of nature to achieve success; such as blood magic, necromancy, conjuring/evocations/summoning/invocations, darker deities dealing with death/destruction/violence/the night/the afterlife/spirits, the list goes on. But because it uses these doesn’t mean it’s evil.
It all boils down to fear. It is human nature to fear things they don’t know or understand, and when they fear something they want to destroy it. The close and narrow minded people have a difficult time understanding that magic isn’t evil, but rather the people who wield magic determine if it’s good or bad. Take metal for example. Metal it self isn’t evil and can be fashioned into practically anything and has so many functions. But if it’s made into bullets and guns, does that constitute that the metal is bad? No, it all depends on the intent behind the person pulling the trigger. The bullets could be used to protect, nourish through hunting, and at times even help with other situations that don’t involve death and injury by the bullet. Same with magic.
There are those that will call themselves and black witch, or a green witch and so on, but only after the kind of magic the practice. Just because they’re a black or white witch doesn’t mean that they’re good or evil. Like I’ve been saying it all depends on the intent of the witch when crafting.
There is nothing to fear from black magic, the dark arts, or from someone calling themselves a black witch. Sometimes one kind of magic just doesn’t cut it for your objective, so what do you do? Simple, you turn to another kind or color of magic. You want to commune with the dead, that’s black but not evil. Want to protect yourself with a blood ritual, prick of the finger or animal’s blood (not killing the animal for it’s blood hopefully) and that’s it. Not evil. Summoning up a spirit/entity isn’t evil either, unless you set it loose to specifically harm someone.
As long as you abide the laws of magic you’ll do just fine.
And it harm none, do what ye will.
What ye send forth comes back to thee, so ever mind the law of three. (What you do will return to you times three)
Some information from: ( http://ancientblackmagic.com/black_magic.php )