How to Make Your Own Detector - Lapidary World
2018-5-28 · How to Make Your Own Detector 101 Etching For the next step, employ a liquid-tight, plastic tray. One inch of depth, more or less, will be fine. An old soup bowl can also be pressed into service, but don’t use a metal tray and don’t use a container that is cracked or chipped. The tray need not be more than an inch larger all around than the
