Posts tagged ‘reused’

The Purpose of Beer Bottle Bumps

Many people have noticed the small bumps on the side of beer bottles, near the base (the “heel”). They’re not just on beer bottles either, every glass bottle in my house has them, which are mostly beer bottles.

These are typically called “mold codes” or “heel codes” and there are many different ideas about what these are for, but I could only confirm one.

It is a popular notion that these bumps help the bottler know how many times the bottle has been reused. I couldn’t find any proof that they are used for this. In fact, I’m not sure how these dots would convey that information since they are made when the bottle is molded.

This rumor seems to confuse the heel code with bottle date codes, which are traditionally found on the neck of the bottle. On newer bottles, date codes are stamped with ink. On older bottles, they were part of the glass mold and were often beside an embossed logo from the glass producer or bottler. Dating on older bottles helped bottlers know how long they had been in circulation. (more…)

March 26, 2010 at 12:01 am 7 comments


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