Lets get something straight. Magick itself does not have color. Magick is energy, it is neutral, it is incapable of thought of it's own and therefore cannot be catagorized by an intention of which we give color to. What we colorize is the intention of the magick user. Magick is the tool we use to bring about our change in accordance with our will.
To answer your first question, no. I did not have a master, nor did I need one. I used the path I am currently on as a means to find myself, my passions, my purpose, and happiness. There was also nobody available to teach witchcraft in my community. So, with absence of a teacher, I took to books and articles about all sorts of practices and eventually wound up to where I am today. Still reading, still learning, expanding my consciousness as always.
I suppose I sort of answered your second question already, so I am going to leave it at 'yes'.