For sale, is a Mathmos Astro bottle. The green is vivid and looks really nice when flowing. The wax is a yellowy orange colour. The wax flows really well. The wax is does have a few air bubbles, for a while when flowing (see last 3 photos) but I've found that most disappear/improve the longer that the lamp is operating. This bottle is an older Mathmos one, which doesn't have the ridge in the glass, where it sits in the base.