Is your liquid 100% milk? Mine all turn a beautiful shade of tan, but it throws off the colors....blue blue becomes teal, etc. TD helps, but that fades out the darker colors.
I do use 100% in a couple recipes. I freeze the milk and add the lye very very slowly. I do get pretty true colors. I also use unrefined shea & cocoa butter as well as silk so I do add a little bit of TD to the base then separate and color. I use the micas from Nurture Soap Supplies and some from TKB as well as oxides, ultramarines and clays and have had really good luck.