Neptune is a lovely blue AuraTone™. It works smoothly in a wide range of flame types. Radiant, or “incidental” heat will grow the inner atmosphere. It is also typically more pronounced in thicker forms. This color is slightly stiffer than clear and requires higher temperatures for proper annealing.
Garage often and give the piece plenty of soak time based on its size and shape.
Recommended Garage/Anneal temp 1085°F
A good rule of thumb is to double your soak time for thick and/or hollow forms with interior components. As with any complex glassblowing, we suggest using a polariscope whenever possible to make sure all stress is relieved before moving on to next steps/assembly.