You can either add it to your oils before lye/water or when you have a light trace. Once added you may want to stir it well. Some EO/FO's will set up quickly. As for usage rate I would check with your suppliers. Most will tell or list these. Adding ginger slices or juice probably wouldn't add anything to your soap. You would need an EO or FO. Most liquids (teas, juices etc) don't retain their scent once exposed to the lye monster. Also, a lot of additives or botanicals will turn brown when added to soap and/or look like mouse turds.
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