An acid-proof protective coating applied to metal plates to limit areas of etching.
An acid-proof protective coating applied to metal plates to limit areas of etching.
中义一种涂布在金属版上的抗酸性保护层，可限制腐蚀的範围。
An acid-proof protective coating applied to metal plates to limit areas of etching.
中义一种涂布在金属版上的抗酸性保护层，可限制腐蚀的範围。