Micas and oxides may be your best bet. Clay is a possibility, but I haven't yet tried it personally.
I've been delving into natural colorants and I still don't have a green. Using botanicals and seaweed is misguided because those greens come from chlorophyll. That light-sensitizes your soap so that it's just going to fade quickly and the oils will actually oxidize more rapidly.
I've been delving into natural colorants and I still don't have a green. Using botanicals and seaweed is misguided because those greens come from chlorophyll. That light-sensitizes your soap so that it's just going to fade quickly and the oils will actually oxidize more rapidly.