Black Magic
All magic is the same colour, casting a spell some considered to be black magic because spells manipulate a situation, the magical powers mould, shape and coerce things to go the way you request in your spells. A spell is a spell, it works magically.
What is black or white is you and your request, if you are casting love spells for the one you desire to be with you, your spell is warm and positive, if you are casting a spell to pass an examination it is positive, but if you are casting a spell to punish someone then that becomes black magic.
The 6th & 7th Books of Moses: Moses' Magical Spirit-Art contains some very strong controlling spells and Moses was a man of the Bible as is King Solomon whose book Keys of Solomon has some very manipulative, strong spells in it. Most witches would then agree there is only one thing that is black or white, and that is your intention.