PIC 7, 8, 9
Now onto sanding! Your torched and the quenched piece will look rustic with lots of black fire scale (see pic 8). Not to worry, most of it will come off easily. This is the fun part because you will see what your piece looks like after you sand some of the fire scales off. Even if I use machines to sand I generally do the first round with 400 grit sandpaper. You will quickly see the results.
Use the metal file (or grinding wheel) to form the corners of the copper. You will need to smooth each sharp corner by filing directly on the corner. Then see if there are rough edges that require metal filing. (pic 9) There might be nicks where your cutting wasn’t perfect. Then continue with the 400 grit sandpaper, all around the piece. Finish sandpapering with 600 grit. (Of course, you could go finer after that if you wish to smooth it more). Use your judgment on the sanding, the more you sand the smoother the end result will be. The steel wool is used for the final buffing, it will bring out more shine.
I don’t coat these copper rings with any type of clear coat. They can easily be brought back to shine if they tarnish with steel wool or other simple methods. Copper is believed to have beneficial qualities for your health and many people prefer wearing it pure on the skin. You might get slight coloring on your finger, but it is nothing be concerned with.
Picture 10 is an example of machine sanding using a Dedeco abrasive wheel and a medium buffing wheel.
See video Ring-Sanding