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How is a tagged stamp noticed when collecting?

In: Stamps [Edit categories]

Answer:

The simplest way is to expose the stamp to various wavelengths of ultraviolet light. They stamps will glow.

Often the tagging can be seen with the eyes if the stamp is held at an angle to the light.

Contributor:

Aggie80

First answer by Aggie80. Last edit by Aggie80. Contributor trust: 4976 [recommend contributor ]. Question popularity: 2 [recommend question].

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