Original sentence: After trade with Europe developed in the late 1500's, some Japanese swordsmiths started using European steel.The majority of the swords of other cultures were of a moderate hardness throughout the blade.Traditional Japanese steel is called tamahagane, and unlike European steel is never fully melted during production, making it relatively heterogeneous
Edited sentence: 45 ACP round from a handgun without sustaining damage, and managed to withstand seven direct hits from an M2 machine gun and its.50 BMG armor-piercing bullets before shattering.After trade with Europe developed, some Japanese swordsmiths started using European steel, and would at times indicate it on the blade.In extreme slow-motion footage of this test, some bullets were cut perfectly in half as their path of motion was unchanged.In tests a traditionally forged katana was able to shatter a.The majority of the swords of other cultures were of an even moderate hardness throughout the blade.The same blade also proved impenetrable to an iron-cutting machine.The technique is called soete tsuki.These feats are often attributed to the katana's hard but resilient martensite and pearlite structure, although it is not known how the swords of other cultures would do in such a test.Traditional Japanese steel, called tamahagane, is popularly considered to be one of the best for creating swords, but European steel generally required less labor to make a sword from