Torch: Flame Types & Temperature
火焰着色：火焰类型与温度
标签：火焰, 温度, 教程
常用丙烷/天然气喷枪。要点：用**还原焰（内焰，略欠氧）**均匀加热，避免氧化焰（外焰过氧）致局部过烧发黑。温度判断靠颜色与经验：铜约 200℃ 起现浅黄，400–500℃ 转紫蓝。可借助测温笔/红外枪辅助定位。加热要"扫动"而非定点，防局部过热。火焰法胜在即时、局部可控，是首饰小件首选。
Common: propane/natural-gas torch. Use a **reducing flame (inner cone, slightly oxygen-lean)** for even heating; avoid the oxidizing flame (excess oxygen) that over-burns to black. Judge temp by color/experience: copper shows pale yellow ~200℃, purple-blue at 400–500℃. Temp sticks / IR gun help. Keep the flame moving, never dwell, to avoid hot spots. Torch wins on instant, local control — first choice for jewelry. ---