Magick to me doesn't have a color, it is neither black, white, grey, green or what have you. Just like nature, it has its light and shadow aspects (sorry if this doesn't make sense). It depends on what your intent is for working your magick. But everything you do mundane or magickal has its effects on the world, everything and everyone is connected. Do good you will recieve good do bane you will recieve bane. Shadow magick as I like to use it is dark but yet if used for positive can have great effects on your person. Useing shadow magick to reach inside and heal tramas and soul retrieval and necromancy can be very positive and healthy. With necromancy you learn not to fear death and you learn so much about death and you work with spirits. I'm not going to go in detail as I've haven't practiced necromancy as I have enough exp with spirits and death as it is.