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SPECIAL INKS - INKS THAT CHANGE IN

RESPONSE TO SUN LIGHT AND TEMPERATURE

V. Ryan 2004

 

Inks that respond to sunlight are called photochromic inks. Variations in the level of ultra violet light determine the colour they display. A possible application of this type of ink is a sunbathing monitor.
Sunbathers are in great danger of damaging their skin from lying in direct sunlight for too long. Sunburn is painful and dangerous and can even lead to skin cancer. A sunbathing monitor could warn the sunbather to move into the shade.
The diagram to the right shows an irresponsible sunbather. He has been drinking alcohol and lying in the sun for hours. When he eventually decides to look at his sunbathing monitor, he finds the photochromic inks have changed colour to red. He must go into the shade quickly before his skin is damaged further.

 

Ed the Handyman ignores sunbathing advice form the EEC (European Economic Community) and burns badly in the sun.

QUESTION:
1. Describe a practical application of photochromic inks, other than the one shown above.
   

 

 

 

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