I have recently started Color Case Hardening , and I have found through much research, that there is not a whole lot of information about CCH online. The best info I have found online was on a Marlin Forum & an article on the Double Gun Journal. Through Trial and Error , I have been able to obtain pretty decent results , but not as good as I'd like. If you have any experience CCH, or if you have any tips you would like to share , it would be much appreciated . I'm going to explain how I have been Color Case Hardening , and if anyone has any questions, or recommendations feel free to comment . First I get the Receiver/Parts to a pretty decent finish, I don't usually exceed 400 grit sandpaper. I then clean the parts very well , by soaking in Denatured Alcohol , or Acetone. I wear gloves when handling the parts after cleaning . I have been wrapping wire around the Parts/Receiver here lately , but I have a better method I'm going to try next time. I do this because, It seems when the Charcoal is in contact with your workpiece a little bit longer when quenched , you get more color; when the Charcoal is immediately washed away , it often doesn't get much color . I have been using a 2:1 bone/wood Charcoal mixture . I have been making all my Charcoal at home . I usually heat at 1300-1400 for about 2 hours , then remove the crucible and quench in ice cold water . I aerate the water heavily , and cut it off right before quenching. I'm fairly new to this , so any tips , or info would be great. I am noticing that most the things I CCH , have bright colors as soon as I remove from the Quench, but soon get a little dark after applying some oil rig. I have heard of people applying a coat of clear Lacquer, but I have not done this. I would just like to achieve brighter colors...I am getting good colors , just not too bright . I heard that it isn't necessary going beyond 400 grit sandpaper , but I'm going to try going to a high Polish, and see if it makes a difference. I will post some pictures later of some of the things I have done. I have also heard that tempering at 350 for about 30 minutes, after it's finished , will enhance colors...haven't tried that , but I'm open to ideas.