Do-It-Yourself Rubber Stamp Project
16. Take a look.
Inspect the results. If the edge of the bottle cap makes a thin, curved line or a complete circle, don't be surprised.
Also, notice that in the photo above, the centers of the J and the P are somewhat lighter red than the rest. That's normal.
If you don't want that, experiment with pushing your finger down on the center of the bottle cap (without the bottle attached) when you use the rubber stamp...or try a design that has thinner (but not VERY thin) parts.