STAMP COLLECTING
'(<a href="http://www.j-archive.com/media/2010-01-04_DJ_19.wmv">Kelly of the Clue Crew shows a stamp on the monitor.</a>)  In the authentication process of certain <a href="http://www.j-archive.com/media/2010-01-04_DJ_19.jpg" target="_blank">stamps</a>, detection fluid is applied to the <a href="http://www.j-archive.com/media/2010-01-04_DJ_19a.jpg" target="_blank">back</a>, revealing <a href="http://www.j-archive.com/media/2010-01-04_DJ_19b.jpg" target="_blank">this</a> type of transparent impression'
a watermark