There is another approach that has been discussed here in the past. Essentially heating the metal to about 175F to 200F and applying cold blue or other chemicals. Some have reported excellent results with this approach.
Pete [/quote]
Yes Sir, I too have used a torch to heat metal to just above the temp that you can't hold onto the metal and applied OXPHO cold blue. As I said before it does not wear. In fact the colors are brighter than any BC I've ever seen. The first time I tried it, I thought it was just slicker than sliced bread. To bad it won't wear.