硫化钠配方
硫化钾
标签：配方, 硫化钾, 硫化钠, 大件
硫化钾（K₂S）溶液是肝硫的"纯品"替代：**K₂S 10 g + 蒸馏水 100 ml**，加 1–2 g 碳酸钠助溶，避光保存；涂于洁净铜面数分钟成均匀深棕至黑膜，50–60℃ 水浴可加速趋蓝黑。优点成分可控、异味小；缺点强碱性，须戴手套。大件或低成本可用硫化钠（Na₂S）溶液 5–10 g/L，着色快、膜黑亮，但碱性更强，银器易发黄，铜器做旧效果佳。务必中和并彻底水洗。
Potassium sulfide is a "pure" liver-of-sulfur alternative: **10 g K₂S + 100 ml distilled water**, add 1–2 g sodium carbonate, store dark; on clean copper it forms an even dark-brown-to-black film in minutes; a 50–60℃ bath speeds it toward blue-black. Pros: controlled, low odor. Cons: strongly alkaline — gloves required. For large/low-cost work use sodium sulfide (Na₂S) at 5–10 g/L — fast, glossy black, but stronger alkali can yellow silver; excellent on copper. Always neutralize and rinse well. ---