Pattern welding is a process where you start with two different types of steel and stack pieces of them on top of each other alternating the steel with each layer. Then, you tack weld them all I'm place, and pit them in the forge. Once the steel has reached 2,900°-3,000° F, you forge weld the entire thing together. Then you draw out your "billet" and cut it into two or more pieces, stack the peices, and repeat the process. This adds more layers of steel to the billet each time. After that you forge the bike into a knife. Once the heat treat is finished, you polish the blade and acid etch it. The acid eats away at one of the steels more then the other, and you are left with a beautiful woodgrain like finish. I am very excited about this knife, and pretty happy with this attempt at pattern welding. I'll be doing more of this in the future, if you have any interest or questions about a damascus knife, let me know! This one is forged from 21 layers of 1095 and 15N20. The blade is 5" long, 3/16" thick and the OAL is 9.5" long. The handle is made from natural canvas micarta with copper pins.