You are getting some of the best case colors I have seen on renovations. I have had case color hardening done on restoration work by three different very well known names in the US, one now retired and no longer doing work, the remaining two still widely known and respected. Your colors seem consistently better than their work on about 8 different guns, including a Mauser action I just got back in for a rifle build and a pre WWI vintage Merkel recently received back. Publish your book on your methods, including lots of photos. It'll sell.
