I'm working with prismacolor on copper this weekend. A pendant is in an ammonia solution tonight, then tomorrow I'll start layering the colors. I'm looking forward to getting this design out of my head and onto the metal. I will post what the process looks like tomorrow. For those who want to explore tonight, here is the blog of a woman who posted her experiences:
She has some examples of work she did over a patinaed inner core, and the colors are gorgeous! Looking forward to tomorrow!