These bottles were made by blowing molten glass into a mold. After removing the bottle from the mold, the blow pipe was sheared from the bottle, leaving a thin irregular lip. The usual step of reheating the lip and hand-forming it into a thicker, smooth lip was eliminated to reduce the time and cost of producing these expendable ink containers. A cork was used to seal the ink in the bottle. These small inks could be used as an inkwell as well as a container. The color is general various shades of aqua or pale green. There are several different shapes, including square, round, octagonal, and conical. These bottles were made from the mid 1800's until about 1900.