An ancient Greek core-formed dark blue glass spherical aryballos, decorated with light blue, white and yellow bands and zig-zags, with yellow lip and handles.



Core-formed glass was produced in the ancient Mediterranean between the 6th and 1st centuries BC. The manufacture of a core-formed vessel was relatively simple. A core of organic and inorganic materials, probably a mixture of clay and an organic binder, was made in the shape of the vessel's interior. This was attached to the end of a rod, which was then dipped into molten glass. To finish the vessel after the glass had cooled, the core materials were removed from the interior.