Engraving is a technique by which decorative patterns or inscriptions are cut into the metal surface with a sharp tool of hardened metal. Etching is a chemical process which removes metal in a controlled manner using an acid to create a design. Etching is similar to engraving, except instead of using a sharp tool, you would use a chemical to remove small amounts of metal.
What would happen if the etched plate remained in the acid bath for a long time?
What gas is evolved on the surface of the copper plate when it’s reacting with Acid?
How do you remove the paraffin wax after the etching is complete?
