When Yu Lulu's fingertips were stained with fine copper shavings, the sunlight had just passed through the glass window of the "Guyuan Copper Art Workshop" at 7:30 in the morning. She sat in front of the workbench by the window, with three drawings spread out in front of her: one was a custom-made antique copper incense stick, one was a structural disassembly diagram of the workshop's new quarterly product "Copper Paperweight with Lotus Pattern", and another was filled with densely packed parameters - the elongation rate of the copper material with a purity of 99.7%, The temperature curve during casting, and the potassium sulfide concentration ratio for later distressing.
