I’ve been practicing more with fold forming and this is a fairly simple double sided fold in copper. Rather than bright polish it, I decided to add a patina. After experimenting with solutions to produce a blue coloration, I achieved this result simply by localised heating with an oxy/gas torch and a very fine tip. The finish is then protected with a couple of coats of clear acrylic lacquer. The pin is stainless steel hard soldered on to the back.