The design to be printed is painted directly onto a zinc plate with asphalt varnish which acts as an acid resist.
先用沥青制假漆作为抗触膜,在锌版上直接绘画图案。
acid proof asphalt varnish
耐酸沥青清漆
emulsified asphalt varnish
乳化沥青漆
The design to be printed is painted directly onto a zinc plate with asphalt varnish which acts as an acid resist. The non-printing area is etched away with dilute nitric acid.