A small puck-like seal (IMAGE)

DOE/Sandia National Laboratories

A small puck-like seal

Caption

A Sandia National Laboratories postdoctoral researcher holds up a prototype tamper-indicating device. The colored speckles make each device near-impossible to counterfeit, while the solution inside turns brown if the casing is cracked or the wire is pulled, indicating attempts to access whatever is behind the device.

Credit

Photo by Craig Fritz/Sandia National Laboratories

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