My interest in removing bottle bottoms is that it provides material that I use to develop my flint knapping skills. Admittedly, a 40 oz. bottle is preferred because it provides the most glass to work with but requires a rod of some sort to strike it out from within the bottle. But a regular 12 oz. size bottle still has usable material for practice and is much more plentiful to acquire.
There are other uses for the remaining bottle. For instance, when inverted, the bottle becomes a funnel and can be strategic for adding fluids to your automobile in an emergency situation. Another use is as a stationary or mobile candle holder complete with integrated chimney and handle.
How do you remove the bottom? Begin by filling the empty bottle with water until it is 2 inches from the top. With one hand, use your thumb and fore finger to surround the lip of the bottle while holding the neck, and with the other hand strike the opening with the butt of your palm. It’s best to do this over a soft area like a lawn to prevent breakage of the released glass and to absorb the spilled water. Be sure to pick up any remaining glass shards that fell to the ground during the process. It’s important to note that thin glass bottles might crack upwards while releasing the bottom. I have had no problems from this but you should take any safety precautions that you deem necessary.
With a little practice you should experience success. I’m still working toward larger bottle sizes with hope of overcoming the 40 oz. barrier of resistance.Click HERE to view a short video demonstration.