From Rubbing to Etched Copper Wall Panel
配方：拓片转铜面蚀刻壁饰
标签：拓片,感光转印,三氯化铁,蚀刻壁饰
把馆藏授权拓片转为蚀刻铜壁饰：1200 dpi 扫描 → 去灰底并二值化（阈值 128）→ 硫酸纸激光打印热转印（150 ℃）或感光油墨曝光。三氯化铁 38°Bé、32 ℃ 蚀刻 8–12 分钟得约 0.3 mm 深、保留墨韵层次的版面；蚀后 5% 草酸退净残膜并中和。批量复制前须取得馆藏机构书面授权，成品编号并附授权复印件。
Turn a licensed rubbing into an etched copper wall panel: scan at 1200 dpi, clean the ground and binarize (threshold 128), then transfer via laser-printed vellum at 150 °C or photoresist exposure. Etch in 38°Bé ferric chloride at 32 °C for 8–12 min for about 0.3 mm relief that keeps the ink-tone gradations; strip resist in 5% oxalic acid and neutralize. Batch copies require written authorization from the holding institution—number the editions and ship a copy of the licence. ---