There is a easy way to treasure hunt and prospect without using a metal detector. The item is called a black light or more correctly a Ultraviolet light. They come in two forms, Shortwave and a Long wave. You will need one that operates on batteries.
A long wave is probably a better choice because it is safer to use. You do not need eye protection. With a Shortwave it is necessary to use eye protection so you do not hurt your eyes. Do not stare into the shortwave light. Vision is a good thing. Always read the instructions that come with the light.
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