I believe by doing a chemical test will be the best option because you are actually testing if it is authentic.
These ancient people utilized the bartering system to get the food, weapons, and spices they needed. Because of salt's great value, Roman soldiers bartered their services for the empire in exchange for salt. In Colonial America, the colonists used bartering to get the goods and services they needed.
George C. Marshall
in 1947 and implemented in 1948 under the Economic Cooperation Administration.
We them so we will have laws