Acid resist: An acid-proof protective coating applied to metal plates prior to etching designs thereon. Dichromate colloid solutions employed in photoengraving provide acid resists through the action of light on the sensitized surface.

• 抗触膜:在触刻图案前涂在金属版面上的抗蚀保护剂。重铬酸盐胶液是照相蚀刻版（俗称电版）所用的感光液及抗蚀膜。光线的照射引起它的抗蚀作用。