Designing a Secondary-school Etching Unit

Designing a Secondary-school Etching Unit

中学版画课的蚀刻入门课程设计

type:tutorial · level:beginner · material:copper · scale:decorative-object · equipment:hand-tools · equipment:press · stage:etching · stage:printing

标签：课程设计, 中学版画, 安全蚀刻, 教学法

面向 14–18 岁的蚀刻课必须绕开强酸：改用 150 g/L 柠檬酸加 100 mL/L 双氧水体系（透明可视、废液易中和），或盐水电解蚀刻（9 V 电池加食盐溶液）。4 课时结构：①讲凹版原理并观摩丢勒铜版仿真图；②蜂蜡加沥青黑涂底、竹笔刻线；③蚀刻 20–30 min，放大镜观察线条；④油墨上版、纱网擦墨、压印机出画。安全规则计入评分：护目镜与丁腈手套全程佩戴、蚀刻区限 2 人同时作业、废液统一倒入中和桶。上海多所中学美术课已用此方案替代传统硝酸蚀刻。

A 14–18 etching unit must dodge strong acids: use 150 g/L citric plus 100 mL/L peroxide (transparent, easily neutralised) or salt-water electrolysis on a 9 V battery. Four sessions: 1) intaglio principles with facsimile Dürer engravings; 2) a beeswax-and-bitumen ground drawn with bamboo styli; 3) a 20–30 min etch, checking lines under magnifiers; 4) inking, tarlatan wiping, press pull. Safety rules are graded: goggles and nitrile throughout, two students max at the etch station, all spent baths into one neutralising drum. Several Shanghai schools now run this in place of nitric acid.