He placed the block into the heated forge and waited about 35 minutes, removing the block when it was molten. “It goes from 800 degrees Celsius to room temperature in a minute,” Mr. Brennan said. “This is when the hard work begins,” Mr. Brennan said. But, in a process he described as magical, Mr. Brennan dropped the blade into an acid bath and left it there for two minutes. “The steel goes from a piece of shiny metal to a beautifully pattered piece,” he said.

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