Sabine has posted a how-to video on Keum-boo, the Korean technique for adding gold to silver without soldering. View it here: http://alienorbijoux.canalblog.com. In English and French.
How does Keum-boo work? It’s a diffusion bond. You can read more about what that is at ganoksin.com, in an article by Charles Lewton-Brain, here: www.ganoksin.com.
What tools do you need to do Keum-boo? I have a post on that! It’s here: creativetexturetools.com/news