Anywhere the mask wasn't uncovered with the uv Mild, the diazo washed absent, leaving a spot the blast media can penetrate the award's space. This is when the media remaining shot at significant velocity hits the crystal region slowly and gradually etching it. Abrasive etching, also referred to as sandblasting https://manuelgyrmq.ampedpages.com/5-essential-elements-for-travolution-awards-59837312