Silk and the Samurai Sword both have gone through chemical changes to be created.Silk has gone through a chemical change in which water turns into protein fiber. Silk solution is set at room temperature and lets protein fibers assemble. The solution is then boiled and the fibers are detached while the water evaporates. Which creates silk.
The Samurai Sword goes through a chemical change by mixing iron and charcoal to make steel. This happens when iron and charcoal are heated together. After steel is made and heated, it is separated into two groups; low carbon and high carbon, Low carbon allows shock absorption, and high carbon is used for the edge of the sword. A blacksmith will shape the high carbon steel so low carbon will be able to fit in. Later the sword is heated again and then placed in water to cool to create a curve on the sword. Which creates a Samurai Sword.
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