Thank you very much, Dijana. All in all about 60 hours.
I've been asked before what silverpoint is. There are various ways to do it. I learned it from Ralph Mayer’s book on Artist's Materials and Techniques. This is how I work:
I use a Pentel 0.3mm mechanical pencil. At the jewelers I buy a 0.3mm length of pure silver and cut it to the length that the pencil uses for led. So now the pencil has not lead but pure silver to draw with. I sharpen the silver on 0000 sandpaper to a sharp point. Then draw as usual only on paper laid with a coat of Chinese White watercolor. There can be no mistakes because you can't erase. Over time, just like all silver, the drawing corrodes to an indescribable beautiful brown color.