Lavender Blue Glycerine Pure glycerin soap enhanced with Ultramarine blue and 100% Lavender Essential Oil for a fresh soothing scent – pure aromatherapy. This glycerine based soap is coloured with blue ultramarine. Ultramarine is also called lapis lazuli. We add a lot of lavender essential oil so the fragrance is long lasting. Use the bar a few times and it takes on a beautiful blue translucency; it looks like blue glass when you hold a bar up to the light.