Does not leave a scent. As osso said, it can just be chilled, but I froze mine into ice cubes, then slowly stirred in the lye. It was just thawed when I finished stirring the lye in. (I soap at room temp.) It does add to lather, and IMO moisturizing a bit. Mine contained guar gum, which accelerates trace a bit, though it is not unmanageable.