10 mL cobalt blue glass oil roller bottle. Glass has high clarity, can be
colored, has high chemical-resistance levels, and has extremely high
resistance to heat and cold. It is great for storing essential oils. All
glass containers are lead free. This container is
cobalt blue, an electric and vivid blue. In the case of glass, cobalt
blue is made by mixing cobalt oxide into the base glass. This cobalt blue color provides some UV
protection for light-sensitive products.