Metal detector enthusiasts in the British Empire have been making remarkable discoveries lately. In Kent, England, a pair of treasure hunters found a horde of gold coins dating from the 14th century that are worth about $20,000. And just last week in Suffolk, England a butcher with a metal detector discovered about 750 Roman-age coins buried in a field. Their value? Priceless.

Have you stopped to think how rare discoveries like those are, and how much more likely it is that you will discover quantities of precious metals in powders, shavings, sludge and other stuff that doesn’t look valuable? In other words, the crud that you will find lying around in old businesses and factories? If you don’t know where money can be found in crud, we will tell you in today’s post.