Zoe I think your question is about actions and outcomes as I percieve you to be a results driven kind of gal. I dont mean that in any way badly after all most people on this forum myself included want to move beyond belief into experience and action. But I think the question of Black and White, good and bad is dare I say a metaphysical and theological one.
Is there a benevolent God who created and oversees the Universe and who sees our destiny as realising our spiritual self and returning to him/her? If so White Magic is anything which helps that and that goal in others and Black is anything which distances us from our maker, or others in fulfilling their task of returning. And in that case a lot of people on this forum are in trouble ha
If the Universe is just a seething mass of forces and intelligences which somehow balence out - as i understand say the Tree of Life and inverse tree of the Qlippoth system to represent - but there is no overseeing benevolent God there, then Black and White are all relative, there is only force and form, and we all need to decide on our own version of reality.
I deliberately miss out the Gnostic idea that the world is owned by the Devil as thats still a Christianised belief of course.
For my own two cents worth. I believe acts which create energy or healing for ourselves or others is ‘White’. And acts which destroy or take energy from ourselves or others is ‘black.’ But I think the question of an ultimate deity is so beyond us as to be not worth bothering to conceptualise as our minds are completely unable to percieve it.