Most color case hardening is done at 1400 ---1425 deg. The packing material is bone meal and wood charcoal. The more bone added the harder and the more charcoal added lowers the deg. of hardness. This also works with the colors --- brighter colors come from more bone, less bone gives less color. This is if the ratio of bone to charcoal is 60% bone to 40%charcoal.


Ken Hurst
910-221-5288