Pour the etchant into your etching unit and heat it to 50 C dont overheat it because sodiumpersulfate starts to decompose at over 50C If you dont have an etching unit just fill the etchant into a heat resistant beaker and put it on top of a heatplate. The depth of the etch is controlled by the amount of time the acid is allowed to bite the metal. How To Make A Mezzotint Etching To begin with you need to make sure what you want to sketch and what angle you are going to have. . THE ETCHING PROCESS The artist draws with a needle on to a copper zinc or steel plate that has been covered with an acid resistant wax. This technique is similar to the total etch technique but your dental professional applies. Etching is a process in which lines or textures are bitten etched into a metal plate with a variety of mordants acids. Si 2 OH 2 H 2 O Si OH 4 2 H 2. Answer 1 of 5. Create a precise rendering the same scale as the print. ...