4oz cobalt blue glass oil bottle. The
bottle is distinctive in its classic shape. Glass
has high clarity, can be colored, has high chemical-resistance levels,
and has extremely high resistance to heat and cold. 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.