Proteins of all Swords

     The taking of "raw materials" transferring them into more pure materials, followed by using those to make something new. That sentence describes the major commonality of samurai swords and the protein of silk. Yes the processes are different, but the steps to get to the final product are the same in these two marvels. The first step of taking Iron and silk, you have materials waiting to be refined. The Iron gets its carbon levels regulated and the silk gets reversed from thread to a glop of protein and water. The iron is now two types of steel one type has more carbon then the other, you melt those down to make a sword, to make things out of the water and protein you don't need to melt them down, proteins will self assemble provided that you give them a good surface. In the samurai sword there is lower levels of carbon to allow the flexibility of a strike but the outside has more carbon to cut through things. The proteins work together as the water evaporates and even can replicate surfaces on the nano scale.