There is a lot of BS around so called "Black Sands" that some people claim contain huge amounts of gold, platinum, palladium, etc.
But they also claim you can't get it out unless you use some "mystery", "secret", "proprietary" process to unlock the stuff.
Whenever I hear such things I become skeptical! But I don't really know -- is "Demasking" something real in chemistry?
Here, this company even claims to be able to do it right on their website...