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Technology Thermochromic inks
 
Protection strategy Product authentication
Type Overt feature
System Security inks
Medium Secondary packaging
Authentication/Identificaton Authentication
Traceability No
Cost Price on request
Required equipment Heat source (usually body heat from finger pressure suffices)
Vertification level Pharmacist;
User
N.B. Irreversible Thermochromic inks are also available in “cold chain” checks to ensure that products have remained below the desired temperature threshold at all times during their transit (useful when refrigerated products such as vaccines and blood products are not stored in an appropriate manner).
Description Change color or become colorless at a certain temperature threshold. The reaction is usually reversible, allowing the feature to be checked several times. These inks can be turned to a reasonably narrow temperature range, for example they can change color owing to body heat from finger pressure.
 
Strengths Low cost;
Can deter simple attempts at counterfeiting (cannot be scanned or copied);
Easily verifiable (usually body heat from finger pressure suffices);
Can be checked several times;
Can also be used to ensure that the product was properly stored (cold chain not broken for vaccines for example);
 
Limitations Requires that the User know what to look for;
Not considered high security option;
 
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