One way to categorize ink bottles is by size, though they can be divided in plenty of other ways as well. Small ink bottles, which tended to hold just 2-4 ounces of ink, often came in cylindrical shapes, as well as squares, rectangles, or other polygons. Larger ink bottles rarely came in shapes other than cylinders.
Of the cylindrical bottles, there were various versions. The 'cone' shape was the most common. These bottles had flat bottoms and sloping sides, making them steady and unlikely to spill when a pen or quill was dipped—this is the main reason why cone bottles are so prevalent.
Square or rectangular shaped bottles often came in different and creative forms. For example, San Francisco & Pacific Glass Works was responsible for making school house and cottage shaped bottles adorned with faux windows. Even more interesting are the multi-sided (more than four) ink bottles. These often look like a combination of rectangular and cylindrical bottles. Then there are the oddball shapes, which tend to be more sought-after, including 'teapot,' 'umbrella,' and 'turtle' (it really does look like a turtle!).
Though many ink bottles are made of glass, not all are. In fact, it is difficult to come up with a material that hasn’t been used for ink bottles at some point—stone, wood, metal, bone, and rubber have all been shaped in the service of holding ink. Of the glass ink bottles, some were hand-blown while others were molded.
No single manufacturer had the monopoly on ink bottles. Indeed, just about any company that produced glass dabbled in ink bottles at one point or another. Many makers had their own distinct stamp or scar on their bottles. For example, the Owens-Illinois Glass Company’s machine-made bottles had a suction scar on their bases. Some manufacturers, such as Caw’s Ink & Pen Company, made both ink bottles and fountain pens.
Some collectors accumulate ink bottles by era. For example, there are those who prefer 19th-century bottles to all others, while others fancy just the ones produced during the middle of that century. But as with all glassware, color is paramount to collectors. The most valuable colors are unusual ones like yellow and purple, while colors like aqua and clear are more common. Embossed bottles or ones with intact labels also increase an ink bottle’s value, adding aesthetic appeal as well as important information about the bottle's origin.


Inkwells
My first ink bottle.












