## 1. Structural Diagnostic: Natural Shrinkage
Authentic 100-year-old clay undergoes a process called **Nuer Yud**. As moisture leaves the clay over decades, the surface develops microscopic "valleys."
* **The Test:** Look at the edges of the features (the ears or the base). They should appear rounded and soft, not sharp. Sharp edges usually indicate a modern mold.
## 2. Chemical Diagnostic: Calcium Bloom (Kra-on)
Amulets kept in temple vaults (*Kru*) often develop a white, powdery substance on the surface.
* **Authentic:** The bloom appears to emerge **from within** the clay. It is difficult to scratch off.
* **Fake:** The white powder sits on top of the surface and looks like sprayed-on chalk or paint.
## 3. The "Ra-Rak" (Root Vein) Pattern
Under a 10x loupe, look for tiny, irregular cracks that resemble the roots of a tree. These occur naturally as the clay settles. If the cracks are perfectly straight or uniform, they were likely induced by heat in a modern oven.
Identifying a 100-year-old clay (Nuer Din) amulet requires analyzing "Natural Shrinkage," mineral "bloom," and the presence of Kru (chamber) calcium deposits. Authentic clay does not look "dry"; it looks "aged" through structural dehydration.
Researcher Note:
Beware of "Boiled" amulets. Counterfeiters boil new clay in tea or chemicals to simulate age. These will often have a sour or chemical smell, whereas ancient clay is odorless or smells faintly of earth.
Beware of "Boiled" amulets. Counterfeiters boil new clay in tea or chemicals to simulate age. These will often have a sour or chemical smell, whereas ancient clay is odorless or smells faintly of earth.