Magic does not has color. For some reason , i get quite irked when people are ignorant of this fact. It is just labels as the energy carrying your intent is the same as the one you use with your "White" , "Grey" and "Black " Magick.
I think the world are full of stupid and useless classifications which are not accurate at all :/
And You cannot travel back in time. It is purely impossible. You can change your perception and mindset of time but you cannot make it faster , slower , travel through it back and forth etc. ALl you could do is make it seem faster or slower by changing your perception and mindset but not travel through time and those Science-Fiction nonsense.
I feel for your loss but instead you should just move on and leave the issue.