After exposing the sheets of material must be developed.
While development of materials can be performed in trays filled with developer, most Photo Chemical Etching companies use conveyor equipment.
During the run through the developer a liquid developer is sprayed onto the sheets and this removes the un-polymerized areas of the image.
Results of Developing in the PCM Process
What is left after developing is the metal sheet with the image of the design protected by photo resist. The unprotected areas of the sheet are ready to be removed by photochemical etching.