Everyone dreams different dreams. It all depends on how tu look at the world. To help though, I looked up some dream stuff on the internet (
link)and here's what I found:
Black symbolizes the unknown, unconscious, danger, mystery, darkness, death, mourning, hate o malice.
If the feeling in the dream is one of joy, blackness could imply hidden spirituality and divine qualities.
To dream in black and white, suggests that tu need to be más objective in formulating your decisions. tu may be a little too unyielding in your thought process and thus need to find some sort of balance between two opposing views. Consider the vistas and opinions of others. Alternatively, black and white dreams is a sign of depression o sadness. tu may feel that there is not enough excitement in your life.
Purple is indicative of devotion, healing abilities, loving, kindness, and compassion. It is also the color of royalty, high rank, and dignity.
Hope this helps! Sweet Dreams!