hi bill, a few years ago i took a class from james binion. he has
written an excellent text about the process on our own 'tips
form the jewlers bench'. he uses the stainless(?) steel tool
James Binion has a description of the mokume process on the web
at the ArtMetal site. This is the url for the page;
If you haven't been to the site before you might follow the
links on the bottom of the page. Lots of interesting info.