On a serious note, it has been mentioned that ONE component in Jerry's heat treat protocol for Infi involves the dry air cryo quench. The blades are slowly cooled to extremely cold temperatures using air and not a liquid in order to reduce stresses in the blade. Amazing what you can find in the BF Busse archives! A lot or reading though! <img src="/ubbthreads/images/graemlins/tongue.gif" alt="" />